North American species of Festuca.

MLA

Piper, Charles Vancouver. North American Species of Festuca. Washington: Govt. print. off., 1906.

APA

Piper, C. Vancouver. (1906). North American species of Festuca. Washington: Govt. print. off.

Chicago

Piper, Charles Vancouver, North American Species of Festuca. Washington: Govt. print. off., 1906.