APA (7th ed.) Citation

Peterson, R. T. (1949). How to know the birds: An introduction to bird recognition. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Peterson, Roger Tory. How to Know the Birds: An Introduction to Bird Recognition. Boston u.a: Houghton Mifflin, 1949.

MLA (9th ed.) Citation

Peterson, Roger Tory. How to Know the Birds: An Introduction to Bird Recognition. Houghton Mifflin, 1949.