Cita APA (7a ed.)
Staal, S. J. (2011). Why feed my cow? International Livestock Research Institute.
Cita Chicago Style (17a ed.)
Staal, Steven J. Why Feed My Cow? International Livestock Research Institute, 2011.
Cita MLA (9a ed.)
Staal, Steven J. Why Feed My Cow? International Livestock Research Institute, 2011.
Precaución: Estas citas no son 100% exactas.