Cita APA

Kramer, J. 1., & Plotkin, M. J. 1. (1989). The World Wildlife Fund book of orchids. New York: Abbeville Press Publishers.

Citación estilo Chicago

Kramer, Jack 1927-, y Mark J. 1955- Plotkin. The World Wildlife Fund Book of Orchids. New York: Abbeville Press Publishers, 1989.

Cita MLA

Kramer, Jack 1927-, y Mark J. 1955- Plotkin. The World Wildlife Fund Book of Orchids. New York: Abbeville Press Publishers, 1989.