APA (7th ed.) Citation

Santesson, R. (1942). Two interesting new species of the lichen genus Parmelia ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Santesson, Rolf. Two Interesting New Species of the Lichen Genus Parmelia. [Sonderdr.]. 1942.

MLA (9th ed.) Citation

Santesson, Rolf. Two Interesting New Species of the Lichen Genus Parmelia. [Sonderdr.]. 1942.

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