APA

Gradstein, S. R., Churchill, S. P. & Salazar Allen, N. (2001). Guide to the bryophytes of tropical America / S. Robbert Gradstein; Steven P. Churchill; Noris Salazar-Allen. New York: New York Botanical Garden.

Chicago

Gradstein, S Robbert, Churchill, Steven P and Salazar Allen, Noris. 2001. Guide to the bryophytes of tropical America / S. Robbert Gradstein; Steven P. Churchill; Noris Salazar-Allen. New York: New York Botanical Garden.

Harvard

Gradstein, S. R., Churchill, S. P. and Salazar Allen, N. (2001). Guide to the bryophytes of tropical America / S. Robbert Gradstein; Steven P. Churchill; Noris Salazar-Allen. New York: New York Botanical Garden.

MLA

Gradstein, S Robbert, Churchill, Steven P and Salazar Allen, Noris. Guide to the bryophytes of tropical America / S. Robbert Gradstein; Steven P. Churchill; Noris Salazar-Allen. New York: New York Botanical Garden. 2001.