Festus K. Akinnifesi, Gudeta Sileshi, Steven Franzel, Oluyede C. Ajayi, Rebbie Harawa, Wilkson Makumba, Sesbastian Chakeredza, Simon Mngomba, Judith J. de Wolf and Jonas N. Chianu
Agricultural Journal 4 ( 6 ): 260 - 271 , 2009
Amos Gyau, Zac Tchoundjeu, Divine Foundjem-Tita, Ebenezer Asaah, Charlie Mbosso and Steven Franzel
Research Journal of Agronomy 5 ( 1 ): 4 - 9 , 2011