Perspectives on International Relations: Power, Institutions, and Ideas is a comprehensive guide authored by Henry R. Nau. This sixth edition of the book, published by CQ Pr on February 27, 2018, offers an even-handed exploration of four major theoretical perspectives in international relations—realism, liberalism, constructivism, and critical theory. Each chapter applies these perspectives to historical events and current controversies, encouraging students to think critically about global affairs. This edition includes updated analyses of Brexit, the rise of populist leaders such as Donald Trump, and ongoing developments involving ISIS, Syria, and Russia, making it a valuable resource for understanding contemporary international relations.