Cita APA (7a ed.)
Okpara, D., Ikeorgu, J., Njoku, J., & Tarawali, G. (2009). Effect of threeyear fallow with herbaceous cover legumes on soil fertility and sweetpotato production in southeastern Nigeria.
Cita Chicago Style (17a ed.)
Okpara, D.A, J.G Ikeorgu, J.C Njoku, y G. Tarawali. Effect of Threeyear Fallow with Herbaceous Cover Legumes on Soil Fertility and Sweetpotato Production in Southeastern Nigeria. 2009.
Cita MLA (9a ed.)
Okpara, D.A, et al. Effect of Threeyear Fallow with Herbaceous Cover Legumes on Soil Fertility and Sweetpotato Production in Southeastern Nigeria. 2009.
Precaución: Estas citas no son 100% exactas.