Brownlie's Principles of Public International Law has been shaping the study and application of international law for over 50 years. Serving as a single-volume introduction to the field as a whole, the book is one of the classic treatises on international law, now fully updated to order to take account of recent developments. It includes extensive references in order to provide a solid foundation for further research. Authored by James Crawford, the ninth edition further secures the work as the essential international law text for students and practitioners.