APA (7th ed.) Citation

Clark, G. N. S. (1949). The Cycle of war and peace in modern history. C.U.P.

Chicago Style (17th ed.) Citation

Clark, G. N. Sir. The Cycle of War and Peace in Modern History. Cambridge: C.U.P, 1949.

MLA (9th ed.) Citation

Clark, G. N. Sir. The Cycle of War and Peace in Modern History. C.U.P, 1949.

Warning: These citations may not always be 100% accurate.