APA (7th ed.) Citation

Barnet, R. J. (1973). Roots of war. Penguin Books Inc.

Chicago Style (17th ed.) Citation

Barnet, Richard J. Roots of War. Baltimore, Maryland: Penguin Books Inc, 1973.

MLA (9th ed.) Citation

Barnet, Richard J. Roots of War. Penguin Books Inc, 1973.