APA (7th ed.) Citation

Ahti, T. (1978). Two new species of Cladonia from western North America ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Ahti, Teuvo. Two New Species of Cladonia from Western North America. [Sonderdr.]. 1978.

MLA (9th ed.) Citation

Ahti, Teuvo. Two New Species of Cladonia from Western North America. [Sonderdr.]. 1978.

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