APA

Griggs J., American Bird Conservancy, . (1997). American Bird Conservancy's field guide to all the birds of North America. New York: HarperCollins Publishers.

Chicago

Griggs Jack, American Bird Conservancy, . 1997. American Bird Conservancy's field guide to all the birds of North America. New York: HarperCollins Publishers.

Harvard

Griggs J., American Bird Conservancy, . (1997). American Bird Conservancy's field guide to all the birds of North America. New York: HarperCollins Publishers.

MLA

Griggs Jack, American Bird Conservancy, . American Bird Conservancy's field guide to all the birds of North America. New York: HarperCollins Publishers. 1997.