Cita APA (7a ed.)

Perrins, C. (1996). The illustrated encyclopedia of birds: The definitive reference to birds of the world. Greenwich Editions.

Cita Chicago Style (17a ed.)

Perrins, C.M. The Illustrated Encyclopedia of Birds: The Definitive Reference to Birds of the World. London: Greenwich Editions, 1996.

Cita MLA (9a ed.)

Perrins, C.M. The Illustrated Encyclopedia of Birds: The Definitive Reference to Birds of the World. Greenwich Editions, 1996.