Kouakou, A. M., G. F. Yao, K. E. B. Dibi, A. Mahyao, A. Lopez-Montes, B. S. Essis, B. N’zue, B. Kouamé, P. O. Adebola, A. Asfaw, and R. Asiedu. “Yam Cropping System in Cote d’Ivoire: Current Practices and Constraints”. European Scientific Journal, ESJ, Vol. 15, no. 30, Oct. 2019, p. 278, https://eujournal.org/index.php/esj/article/view/12537.