Cita APA

Hines, B. (1973). Ducks at a Distance: A waterfowl identification guide. Washington: U.S. Department of the interior.

Citación estilo Chicago

Hines, Bob. Ducks At a Distance: A Waterfowl Identification Guide. Washington: U.S. Department of the interior, 1973.

Cita MLA

Hines, Bob. Ducks At a Distance: A Waterfowl Identification Guide. Washington: U.S. Department of the interior, 1973.