Aidoo, R. ., F. . Nimoh, J.-E. A. . Bakang, K. . Ohene-Yankyera, S. C. . Fialor, J. O. . Mensah, and R. C. Abaidoo. “Estimation of Margins and Efficiency in the Ghanaian Yam Marketing Chain”. Asian Journal of Agriculture and Rural Development, vol. 2, no. 2, June 2012, pp. 226-34, https://archive.aessweb.com/index.php/5005/article/view/550.