APA (7th ed.) Citation

Foster, S., & Duke, J. A. (1990). A field guide to medicinal plants: Eastern and central North America. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Foster, Steven, and James A. Duke. A Field Guide to Medicinal Plants: Eastern and Central North America. Boston: Houghton Mifflin, 1990.

MLA (9th ed.) Citation

Foster, Steven, and James A. Duke. A Field Guide to Medicinal Plants: Eastern and Central North America. Houghton Mifflin, 1990.