Mello, Patrick A. 2026. Germany: The Travails of Realising the Zeitenwende. In Russia’s War on Ukraine: A Zeitenwende for European Defence?, edited by Tim Haesebrouck, Michelle Haas, and Servaas Taghon. Basingstoke: Palgrave Macmillan, in press.

Mello, Patrick A. 2026. Explaining European Military Engagement in the Fight Against Daesh. In The Changing Fights and Fighters of Contemporary War: From the Margins to the Middle, edited by Marie Robin, Amelie Theussen, and Kerstin Bree Carlson. Basingstoke: Palgrave Macmillan, 185-208.

Mello, Patrick A. 2025. Strategische Zeitenwende? Die Nationale Sicherheitsstrategie als Wendepunkt deutscher Außenpolitik. Zeitschrift für Politik (Sonderband 13), 89-106.

Mello, Patrick A. 2024. Uncovering Causal Complexity with Qualitative Comparative Analysis. In The Handbook of Teaching Qualitative and Mixed Research Methods: A Step-by-Step Guide for Instructors, edited by Alissa Ruth, Amber Wutich, and H. Russell Bernard. London: Routledge, 336-339.

Ostermann, Falk, and Patrick A. Mello. 2023. Methods of Foreign Policy Analysis: Charting Ground, Engaging Traditions, and Opening Up Boundaries. In Routledge Handbook of Foreign Policy Analysis Methods, edited by Patrick A. Mello and Falk Ostermann. London: Routledge, 3-18.

Mello, Patrick A. 2023. Qualitative Comparative Analysis. In Routledge Handbook of Foreign Policy Analysis Methods, edited by Patrick A. Mello and Falk Ostermann. London: Routledge, 385-402.

Mello, Patrick A. 2021. German Foreign Policy. In Foreign Policy Change in Europe Since 1991, edited by Jeroen Joly and Tim Haesebrouck. Basingstoke: Palgrave Macmillan, 155-178.

Mello, Patrick A. 2019. Von der Bonner zur Berliner Republik: Die “Zivilmacht“ Deutschland im Spiegel parlamentarischer Debatten zu Auslandseinsätzen der Bundeswehr, 1990 bis 2018. In Zivilmacht Bundesrepublik?, edited by Klaus Brummer and Friedrich Kießling. Baden-Baden: Nomos, 295-316.

C. Heldt, Eugénia, and Patrick A. Mello. 2018. Two-Level Games in Foreign Policy Analysis. In Oxford Encyclopedia of Foreign Policy Analysis, edited by Cameron G. Thies. New York: Oxford University Press, 770-789.

Mello, Patrick A. 2018. Curbing the Royal Prerogative to Use Military Force: The British House of Commons and the Conflicts in Libya and Syria. In Challenging Executive Dominance: Legislatures and Foreign Affairs, edited by Tapio Raunio and Wolfgang Wagner. London: Routledge, 80-110.

Mello, Patrick A. 2017. Qualitative Comparative Analysis and the Study of Non-State Actors. In Researching Non-State Actors in International Security: Theory & Practice, edited by Andreas Kruck and Andrea Schneiker. London: Routledge, 123-142.

Mello, Patrick A. 2017. Democratic Peace Theory. In The Sage Encyclopedia of War: Social Science Perspectives, Volume I, edited by Paul I. Joseph. Thousand Oaks: Sage, 472-476.

Mello, Patrick A. 2017. New and Old Wars. In The Sage Encyclopedia of War: Social Science Perspectives, Volume III, edited by Paul I. Joseph. Thousand Oaks: Sage, 1209-1211.

Mello, Patrick A. 2016. Asymmetric Warfare. In The Blackwell Encyclopedia of Sociology, second edition, edited by George Ritzer. Hoboken: Wiley.