APA (7th ed.) Citation

Alston, A. H. G. (1940). Undescribed ferns from New Guinea ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Alston, A. H. G. Undescribed Ferns from New Guinea. [Sonderdr.]. 1940.

MLA (9th ed.) Citation

Alston, A. H. G. Undescribed Ferns from New Guinea. [Sonderdr.]. 1940.

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