APA (7th ed.) Citation

Tryon, R. M. (1946). A new Dryopteris ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Tryon, Rolla Milton. A New Dryopteris. [Sonderdr.]. 1946.

MLA (9th ed.) Citation

Tryon, Rolla Milton. A New Dryopteris. [Sonderdr.]. 1946.

Warning: These citations may not always be 100% accurate.