APA (7th ed.) Citation

Ernst, C. H., & Barbour, R. W. (1989). Snakes of eastern North America. George Mason University Press.

Chicago Style (17th ed.) Citation

Ernst, Carl H., and Roger W. Barbour. Snakes of Eastern North America. Fairfax, Va.: George Mason University Press, 1989.

MLA (9th ed.) Citation

Ernst, Carl H., and Roger W. Barbour. Snakes of Eastern North America. George Mason University Press, 1989.