APA (7th ed.) Citation

Barbour, M. G., & Billings, W. D. (1988). North American terrestrial vegetation. Cambridge University Press.

Chicago Style (17th ed.) Citation

Barbour, Michael G., and W. D. Billings. North American Terrestrial Vegetation. Cambridge [Cambridgeshire] ; New York: Cambridge University Press, 1988.

MLA (9th ed.) Citation

Barbour, Michael G., and W. D. Billings. North American Terrestrial Vegetation. Cambridge University Press, 1988.