APA (7th ed.) Zitazioa
Williams, K. L. (1978). Systematics and natural history of the American milk snake, Lampropeltis triangulum. Milwaukee Public Museum.
Chicago Style (17th ed.) Zitazioa
Williams, Kenneth L. Systematics and Natural History of the American Milk Snake, Lampropeltis Triangulum. Milwaukee: Milwaukee Public Museum, 1978.
MLA (9th ed.) Zitazioa
Williams, Kenneth L. Systematics and Natural History of the American Milk Snake, Lampropeltis Triangulum. Milwaukee Public Museum, 1978.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.