Cita APA

Hitchcock, A. (1950). Manual of the grasses of the United States Gobernment printing office.

Citación estilo Chicago

Hitchcock, A.S. Manual of the Grasses of the United States. 2. ed. Washington: Gobernment printing office, 1950.

Cita MLA

Hitchcock, A.S. Manual of the Grasses of the United States. 2. ed. Washington: Gobernment printing office, 1950.