Tryo, R. M., & Tryon, A. F. (1982). Ferns and allied plants: With special reference to tropical America. Springer.

Tryo, Rolla M., and Alice F. Tryon. Ferns and Allied Plants: With Special Reference to Tropical America. New York, USA: Springer, 1982.

Tryo, Rolla M., and Alice F. Tryon. Ferns and Allied Plants: With Special Reference to Tropical America. Springer, 1982.