International Council for Bird Preservation & Perrins, C. M. (1990). The Illustrated encyclopedia of birds: The definitive reference to birds of the world (1st Prentice Hall ed.). Prentice Hall Editions.
Chicago Style (17th ed.) CitationInternational Council for Bird Preservation and Christopher M. Perrins. The Illustrated Encyclopedia of Birds: The Definitive Reference to Birds of the World. 1st Prentice Hall ed. New York: Prentice Hall Editions, 1990.
MLA (9th ed.) CitationInternational Council for Bird Preservation and Christopher M. Perrins. The Illustrated Encyclopedia of Birds: The Definitive Reference to Birds of the World. 1st Prentice Hall ed. Prentice Hall Editions, 1990.
Warning: These citations may not always be 100% accurate.