Cita APA (7a ed.)

Madge, S., & Burn, H. (1988). Wildfowl: An identification guide to the ducks, geese and swans of the world. Christopher Helm.

Cita Chicago Style (17a ed.)

Madge, Steve, y Hilary Burn. Wildfowl: An Identification Guide to the Ducks, Geese and Swans of the World. London: Christopher Helm, 1988.

Cita MLA (8a ed.)

Madge, Steve, y Hilary Burn. Wildfowl: An Identification Guide to the Ducks, Geese and Swans of the World. Christopher Helm, 1988.