The Anarchical Society, authored by Hedley Bull, is a seminal work in the field of international relations theory. Bull explores the concept of anarchy in world politics and challenges the notion that international relations is solely driven by power politics. He argues that there are multiple sources of order in the international system, including norms, institutions, and diplomacy. The book provides a comprehensive analysis of different approaches to international order and offers insights into the complexities of global governance. Bull's work continues to be influential in shaping the study of international relations.