MLA

Oltjen, James W, et al. Energy and Protein Metabolism and Nutrition In Sustainable Animal Production. Wageningen Academic Publishers, 2013.

APA

Oltjen, J. W, Kebreab, E., Kebreab, E., & Lapierre, H. (2013). Energy and protein metabolism and nutrition in sustainable animal production. Wageningen Academic Publishers.

Chicago

Oltjen, James W., Ermias Kebreab, E Kebreab, and Hélène Lapierre. Energy and Protein Metabolism and Nutrition In Sustainable Animal Production. : Wageningen Academic Publishers, 2013.