APA-referens (7:e uppl.)

Perry, R. (1967). The wolrd of the walrus. Taplinger Publishing Co.

Chicago-referens (17:e uppl.)

Perry, Richard. The Wolrd of the Walrus. New York: Taplinger Publishing Co, 1967.

MLA-referens (9:e uppl.)

Perry, Richard. The Wolrd of the Walrus. Taplinger Publishing Co, 1967.