Adewuyi , S. A., O. E. Fapojuwo, and S. H. Sowemimo. “Economics of Labour Use in Selected Food Crop Farming in Ogun State, Nigeria”. Asian Journal of Agriculture and Rural Development, vol. 4, no. 2, Feb. 2014, pp. 177-8, http://archive.aessweb.com/index.php/5005/article/view/1135.