APA (7th ed.) Citation

Ropp. (1962). War in the modern world. Collier Books.

Chicago Style (17th ed.) Citation

Ropp. War in the Modern World. New York: Collier Books, 1962.

MLA (8th ed.) Citation

Ropp. War in the Modern World. Collier Books, 1962.

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