APA-referens (7:e uppl.)

Allen, J. L. (2008). Annual editions: Environment 07/08 (Twenty-sixth edition.). McGraw-Hill/Dushkin.

Chicago-referens (17:e uppl.)

Allen, John L. Annual Editions: Environment 07/08. Twenty-sixth edition. Dubuque, IA: McGraw-Hill/Dushkin, 2008.

MLA-referens (8:e uppl.)

Allen, John L. Annual Editions: Environment 07/08. Twenty-sixth edition. McGraw-Hill/Dushkin, 2008.