APA (7th ed.) Citation

Mackenzie, J. P. S., & Shortt, T. M. (1977). Birds in peril: A guide to the endangered birds of the United States and Canada. Pagurian Press.

Chicago Style (17th ed.) Citation

Mackenzie, John P. S., and T. M. Shortt. Birds in Peril: A Guide to the Endangered Birds of the United States and Canada. Toronto: Pagurian Press, 1977.

MLA (9th ed.) Citation

Mackenzie, John P. S., and T. M. Shortt. Birds in Peril: A Guide to the Endangered Birds of the United States and Canada. Pagurian Press, 1977.