Cita APA

Proctor, G. R. (1989). Ferns of Puerto Rico and the Virgin Islands. New York: The New York Botanical Garden.

Citación estilo Chicago

Proctor, George R. Ferns of Puerto Rico and the Virgin Islands. New York: The New York Botanical Garden, 1989.

Cita MLA

Proctor, George R. Ferns of Puerto Rico and the Virgin Islands. New York: The New York Botanical Garden, 1989.