APA (7th ed.) Citation

Heintzelman, D. S. (1979). A guide to hawk watching in North America. Pennsylvania State University Press.

Chicago Style (17th ed.) Citation

Heintzelman, Donald S. A Guide to Hawk Watching in North America. University Park: Pennsylvania State University Press, 1979.

MLA (9th ed.) Citation

Heintzelman, Donald S. A Guide to Hawk Watching in North America. Pennsylvania State University Press, 1979.

Warning: These citations may not always be 100% accurate.