Cita APA (7a ed.)

Ahlgren, G. H. (1949). Forage crops. McGraw-Hill.

Cita Chicago Style (17a ed.)

Ahlgren, Gilbert H. Forage Crops. New York: McGraw-Hill, 1949.

Cita MLA (8a ed.)

Ahlgren, Gilbert H. Forage Crops. McGraw-Hill, 1949.