APA (7th ed.) Citation

Gormley, G. (1990). Orcas of the Gulf: A natural history. Sierra Club Books.

Chicago Style (17th ed.) Citation

Gormley, Gerard. Orcas of the Gulf: A Natural History. San Francisco: Sierra Club Books, 1990.

MLA (9th ed.) Citation

Gormley, Gerard. Orcas of the Gulf: A Natural History. Sierra Club Books, 1990.