APA (7th ed.) Citation

Foster, A. S., & Gifford, E. M. (1974). Comparative morphology of vascular plants (2. edition.). Freeman.

Chicago Style (17th ed.) Citation

Foster, Adriance Sherwood, and Ernest M. Gifford. Comparative Morphology of Vascular Plants. 2. edition. San Francisco: Freeman, 1974.

MLA (9th ed.) Citation

Foster, Adriance Sherwood, and Ernest M. Gifford. Comparative Morphology of Vascular Plants. 2. edition. Freeman, 1974.