APA (7th ed.) Citation

Ropp, T. (1981). War in the modern world. Greenwood Press.

Chicago Style (17th ed.) Citation

Ropp, Theodore. War in the Modern World. Westport, Conn.: Greenwood Press, 1981.

MLA (9th ed.) Citation

Ropp, Theodore. War in the Modern World. Greenwood Press, 1981.