Cita APA (7a ed.)
Powell, J. (1986). Cropping systems in the subhumid zone of Nigeria. International Livestock Centre for Africa.
Cita Chicago Style (17a ed.)
Powell, J.M. Cropping Systems in the Subhumid Zone of Nigeria. International Livestock Centre for Africa, 1986.
Cita MLA (9a ed.)
Powell, J.M. Cropping Systems in the Subhumid Zone of Nigeria. International Livestock Centre for Africa, 1986.
Precaución: Estas citas no son 100% exactas.