APA

Tryon R. M., Tryon A. F., . (1982). Ferns and allied plants with special reference to tropical America. New York: Springer-Verlag.

Chicago

Tryon Rolla Milton, Tryon Alice Faber, . 1982. Ferns and allied plants with special reference to tropical America. New York: Springer-Verlag.

Harvard

Tryon R. M., Tryon A. F., . (1982). Ferns and allied plants with special reference to tropical America. New York: Springer-Verlag.

MLA

Tryon Rolla Milton, Tryon Alice Faber, . Ferns and allied plants with special reference to tropical America. New York: Springer-Verlag. 1982.