Cita APA

Ahlgren, G. H. 1., & Ahlgren, G. H. 1. (1956). Forage crops (2. edition.). New York, New York: McGraw-Hill.

Citación estilo Chicago

Ahlgren, Gilbert Harold 1913-, y Gilbert Harold 1913- Ahlgren. Forage Crops. 2. edition. New York, New York: McGraw-Hill, 1956.

Cita MLA

Ahlgren, Gilbert Harold 1913-, y Gilbert Harold 1913- Ahlgren. Forage Crops. 2. edition. New York, New York: McGraw-Hill, 1956.