• Blackwell Dictionary of Political Science (1999)
• Concise Oxford Dictionary of Politics (2009)
• Dictionary of Public Policy and Administration (2004)
• Encyclopedia of Power (2011)

• Anarchist Encyclopedia (2017, abridged)
• Blackwell Encyclopedia of Political Thought (2000)
• Cambridge Companion to Aristotle's Politics
• Cambridge Companion to Christian Political Theology
• Cambridge Companion to Hobbes’ Leviathan
• Cambridge Companion to Liberalism 
• Cambridge Companion to Nozick's Anarchy, State and Utopia
• Cambridge Companion to Plato’s Republic
• Encyclopedia of Democratic Thought (2001)
• Encyclopedia of Libertarianism (2008)
• Glossary of Political Theory (2007)
• Historical Dictionary of Marxism (2014)

• Canadian Encyclopedia 
• Dictionary of Canadian Biography
• Historical Dictionary of Canada (2011)
• Language of Canadian Politics : A Guide to Important Terms and Concepts (2006)
• Palgrave Handbook of Canada in International Affairs (2021, full text link on left)

• Congress A-Z (2014)
• Debates on US Immigration (2012)
• Dictionary of American Government and Politics (2010)
• Encyclopedia of American Parties, Campaigns and Elections (1999)
• Glossary of US Politics and Government (2007)
• Historical Dictionary of the Early American Republic (2016)
• Historical Dictionary of the Jacksonian Era and Manifest Destiny (2017)
• Historical Dictionary of the U.S. Constitution (2016)
• Historical Dictionary of U.S. Diplomacy From the Civil War to World War I (2016)
• Historical Dictionary of U.S. Diplomacy From the Revolution to Secession (2012)
• Illustrated Dictionary of Constitutional Concepts (1996)
• Oxford Guide to the United States Government (2002)
• Oxford Handbook of American Political Parties & Interest Groups (2010)
• Oxford Handbook of U.S. Social Policy (2014)
• Political Encyclopedia of U.S. States and Regions (2009)
• Presidential Appointee's Handbook (2016)
• Presidents and Presidencies in American History (2019, 4 vols., includes a document collection)
• Princeton Encyclopedia of American Political History (2010)

World

United Nations

• Concise Encyclopedia of the United Nations (2010)
• Handbook on the Internal Justice System at the United Nations (2014)
• Historical Dictionary of the United Nations (2018)

Other

• Concise Oxford Dictionary of Politics and International Relations (2018)
• Encyclopedia of International Relations and Global Politics (2005)
• Handbook of National Legislatures (2009)
• Historical Dictionary of International Relations (2017)
• Oxford Companion to the Politics of the World (2001)
• Princeton Encyclopedia of Islamic Political Thought (2013)
• Third World Handbook (2016)
• World Monarchies and Dynasties (2015)

Africa

• African Kingdoms : An Encyclopedia of Empires and Civilizations (2017)
• Dictionary of Contemporary Politics of Southern Africa (2016)
• Encyclopedia of Africa (2020, 11 vols.)
• Handbook on Africa (2016)
• Political and Economic Dictionary of Africa (2005)

Asia

• Dictionary of the Modern Politics of Japan (2003)
• Historical Dictionary of Chinese Foreign Affairs (2018)
• Historical Dictionary of the Chinese Communist Party (2012)
• Oxford Handbook of the International Relations of Asia (2014)
• Routledge Handbook of Autocratization in South Asia (2022)

Australia

• Oxford Companion to Australia Politics (2008)

Europe

• A-Z of Modern Europe Since 1789 (2000)
• Critical Dictionary on Borders, Cross-Border Cooperation and European Integration (2020, open access)
• Encyclopedia of Europe (2015)
• European Union Handbook (2013)
• Glossary of UK Government and Politics (2007)
• Historical Dictionary of the British Monarchy (2011)
• New Russia (2013)
• Political and Economic Dictionary of Western Europe (2005)
• Routledge Handbook of Differentiation in the European Union (2022, open access)
• Routledge International Handbook of European Social Transformations (2022, open access)

Middle East

• Handbook of Israel: Major Debates (2016)
• Political and Economic Dictionary of the Middle East (2004)
• Postrevolutionary Iran: A Political Handbook (2018)
• Princeton Encyclopedia of Islamic Political Thought (2013)
• Routledge Handbook of Minorities in the Middle East (2019)

South/Latin America

• Dictionary of Contemporary Politics of South America (2016)
• Political and Economic Dictionary of Latin America (2011)
• South America Handbook (2002)

• American Political Leaders, 1789-2009: A Reference Handbook (2010)
• Biographical Encyclopedia of American Politicians Who Switched Parties (2011)
• Cambridge Companion to Abraham Lincoln (2012)
• Cambridge Companion to Augustine (2nd ed. 2014)
• Cambridge Companion to Chomsky (2nd ed. 2017)
• Cambridge Companion to Constant (2009)
• Cambridge Companion to Gandhi (2011)
• Cambridge Companion to Hayek (2007)
• Cambridge Companion to Hobbes (1996)
• Cambridge Companion to Keynes (2006)
• Cambridge Companion to Leo Strauss (2009)
• Cambridge Companion to Marx (2006)
• Cambridge Companion to Mill (2006)
• Cambridge Companion to Nelson Mandela (2014)
• Cambridge Companion to Oakeshott (2012)
• Cambridge Companion to Rousseau (2006)
• Cambridge Companion to Thomas Jefferson (2009)
• Cambridge Companion to Thomas More (2011)
• Cambridge Companion to Tocqueville (2007)
• Habermas Handbook (2017)
• Marx Dictionary (2011)

• Dictionary of Human Rights (2004)
• Handbook of International Human Rights Terminology (2004)
• Historical Dictionary of Human Rights and Humanitarian Organizations (2017)
• Human Rights Manual: A Field Mission Manual (2008)
• Lexicon of Human Rights (2008, English and French)
• Practical Guide to Humanitarian Law (2013)
• Routledge Handbook of Extraterritorial Human Rights Obligations (2022, open access)

Security

• Coming to Terms with Security : A Handbook on Verification and Compliance (2003)
• Coup D'État: A Practical Handbook (2016)
• Encyclopedia of Cyber Warfare (2017)
• Historical Dictionary of NATO and Other International Security Organizations (2008)
• International Handbook of Threat Assessment (2014)
• Palgrave Handbook of Security, Risk and Intelligence (2017)

Intelligence

• Encyclopedia of Intelligence and Counterintelligence (2005)
• Historical Dictionary of British Intelligence (2014)
• Historical Dictionary of Chinese Intelligence (2012)
• Historical Dictionary of German Intelligence (2009)
• Historical Dictionary of International Intelligence (2015)
• Historical Dictionary of Middle Eastern Intelligence (2009)
• Historical Dictionary of Russian and Soviet Intelligence (2015)
• Historical Dictionary of Signals Intelligence (2012)
• Historical Dictionary of United States Intelligence (2014)
• Historical Dictionary of World War I Intelligence (2014)
• KGB Lexicon: The Soviety Intelligence Officer's Handbook (2002)
• Spycraft Secrets: An Espionage A-Z (2016)

Terrorism

• Cambridge Companion to Religion and Terrorism (2017)
• Dictionary of Terrorism (2004)
• Historical Dictionary of Terrorism (2009)
• International Handbook of War, Torture, and Terrorism (2013)
• Routledge Handbook of U.S. Counterterrorism and Irregular Warfare Operations (2022)
• Routledge Handbook of Violent Extremism and Resilience (2023, open access)
• Sage Encyclopedia of Terrorism (2011)

Peace and War

• Cold War : The Essential Reference Guide (2012)
• Encyclopedia of Conflicts Since World War II (2014)
• Encyclopedia of Modern Ethnic Conflicts (2016, 2 vols.)
• Encyclopedia of Peace Education (2008)
• Encyclopedia of Political Assassinations (2017)
• Historical Dictionary of Multinational Peacekeeping (2011)
• Historical Dictionary of the Cold War (2017)
• Historical Dictionary of the Dirty Wars (2017)
• International Conflict: a Chronological Encyclopedia of Conflicts, 1945-1995 (1997)
• International Handbook of War, Torture, and Terrorism (2013)
• Nonviolence Handbook (2014)
• Oxford Handbook of Religion, Conflict, and Peacemaking (2015)
• Palgrave Handbook of Disciplinary and Regional Approaches to Peace (2016)

• Activist's Handbook (2013)
• Dictionary of Genocide (2008)
• Green Politics : An A-to-Z Guide (2010)
• Handbook of Political Sociology (2005)
• Historical Dictionary of the Welfare State (2014)
• Oxford Handbook of Food, Politics and Society (2015)
• Oxford Handbook of Propaganda Studies (2013)
• Routledge Handbook of Political Management (2009)
• Political Communication (2014)
• Political Negotiation: A Handbook (2016)
• Policy Analyst's Handbook (2015)
• SAGE Handbook of Political Advertising (2006)
• Science and Politics: A-Z Guide (2014)