APA (7th ed.) Citation

Penn, I. (1980). Worlds in a small room (2. ed.). Viking Press.

Chicago Style (17th ed.) Citation

Penn, Irving. Worlds in a Small Room. 2. ed. New York: Viking Press, 1980.

MLA (9th ed.) Citation

Penn, Irving. Worlds in a Small Room. 2. ed. Viking Press, 1980.