Cita APA

Foster, A. S., & Gifford, E. M. (1974). Comparative morphology of vascular plants (2a. ed.). San Francisco: Freeman.

Citación estilo Chicago

Foster, Adriance Sherwood, y Ernest M. Gifford. Comparative Morphology of Vascular Plants. 2a. ed. San Francisco: Freeman, 1974.

Cita MLA

Foster, Adriance Sherwood, y Ernest M. Gifford. Comparative Morphology of Vascular Plants. 2a. ed. San Francisco: Freeman, 1974.