APA (7th ed.) Citation

Vonnegut, K., & Vonnegut, M. (2008). Armageddon in retrospect, and other new and unpublished writings on war and peace. Putnam.

Chicago Style (17th ed.) Citation

Vonnegut, Kurt, and Mark Vonnegut. Armageddon in Retrospect, and Other New and Unpublished Writings on War and Peace. New York: Putnam, 2008.

MLA (9th ed.) Citation

Vonnegut, Kurt, and Mark Vonnegut. Armageddon in Retrospect, and Other New and Unpublished Writings on War and Peace. Putnam, 2008.