APA-referens (7:e uppl.)

Canadian Wildlife Service, BC Environment. Wildlife Branch, ebrary, Inc, & Campbell, R. W. (2001). Passerines: Wood-warblers through old world sparrows (New ed.). UBC Press.

Chicago-referens (17:e uppl.)

Canadian Wildlife Service, BC Environment. Wildlife Branch, Inc ebrary, och R. Wayne Campbell. Passerines: Wood-warblers Through Old World Sparrows. New ed. Vancouver [B.C.]: UBC Press, 2001.

MLA-referens (9:e uppl.)

Canadian Wildlife Service, et al. Passerines: Wood-warblers Through Old World Sparrows. New ed. UBC Press, 2001.