Gaya APA

Pfeffer, E., HRISTOV, A, N. (2005). Nitrogen and Phosphorus Nutrition of Cattle : Reducing the Environmental Impact of Cattle Operations . USA: CABI PUBLISING.

Gaya MLA

Pfeffer, Ernst., HRISTOV, ALEXANDER, N.. "Nitrogen and Phosphorus Nutrition of Cattle : Reducing the Environmental Impact of Cattle Operations". USA: CABI PUBLISING, 2005. Text.