APA (7th ed.) Citation
Powell, J. (1986). Cropping systems in the subhumid zone of Nigeria. International Livestock Centre for Africa.
Chicago Style (17th ed.) Citation
Powell, J.M. Cropping Systems in the Subhumid Zone of Nigeria. International Livestock Centre for Africa, 1986.
MLA (9th ed.) Citation
Powell, J.M. Cropping Systems in the Subhumid Zone of Nigeria. International Livestock Centre for Africa, 1986.
Warning: These citations may not always be 100% accurate.