Cita APA (7a ed.)

Hitchcock, A. S. (1950). Manual of the grasses of the United States (2nd edition.). Departament of Agriculture.

Cita Chicago Style (17a ed.)

Hitchcock, A. S. Manual of the Grasses of the United States. 2nd edition. Washington, DC: Departament of Agriculture, 1950.

Cita MLA (8a ed.)

Hitchcock, A. S. Manual of the Grasses of the United States. 2nd edition. Departament of Agriculture, 1950.