APA (7th ed.) Citation

Cruttwell, C. R. M. F. (1937). A history of peaceful change in the modern world.

Chicago Style (17th ed.) Citation

Cruttwell, C. R. M. F. A History of Peaceful Change in the Modern World. London ; New York [etc.] ; Oxford university press, 1937.

MLA (8th ed.) Citation

Cruttwell, C. R. M. F. A History of Peaceful Change in the Modern World. 1937.