APA (7th ed.) Citation

Howe, R. H. (1914). North American Species of the genus Ramalina ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Howe, Reginald Heber. North American Species of the Genus Ramalina. [Sonderdr.]. 1914.

MLA (9th ed.) Citation

Howe, Reginald Heber. North American Species of the Genus Ramalina. [Sonderdr.]. 1914.

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