APA

Hitchcock A. S., . (1971). Manual of the grasses of the United States. New York, New York, United States: Dover.

Chicago

Hitchcock Albert Spear, . 1971. Manual of the grasses of the United States. New York, New York, United States: Dover.

Harvard

Hitchcock A. S., . (1971). Manual of the grasses of the United States. New York, New York, United States: Dover.

MLA

Hitchcock Albert Spear, . Manual of the grasses of the United States. New York, New York, United States: Dover. 1971.