Williams. (1989). International relations in the twentieth century: A reader. Macmillan Education.
Chicago Style (17th ed.) CitationWilliams. International Relations in the Twentieth Century: A Reader. London: Macmillan Education, 1989.
MLA (8th ed.) CitationWilliams. International Relations in the Twentieth Century: A Reader. Macmillan Education, 1989.
Warning: These citations may not always be 100% accurate.