APA

Bohnert, D., Chamberlain, D., Filley, S., Hathaway, R., Males, J., Nisley, B., Oldfield, J., Parsons, C., Pawelek, R., Pirelli, G., Porath, M., & Schreder, P. (2004). Beef cattle nutrition workbook. : Corvallis, Or. : Extension Service, Oregon State University.