APA-referens (7:e uppl.)

World Book, I. (1996). The world book encyclopedia: W- x-y-z. World Book.

Chicago-referens (17:e uppl.)

World Book, Inc. The World Book Encyclopedia: W- X-y-z. Chicago: World Book, 1996.

MLA-referens (9:e uppl.)

World Book, Inc. The World Book Encyclopedia: W- X-y-z. World Book, 1996.