D, Ogisi O’raye, Chukwuji Christopher O, and Okeke Daniel C. 2012. “Efficiency of Resource Use by Rice Farmers in Ebonyi State, South East Nigeria: A Data Envelopment Analysis”. Asian Journal of Agriculture and Rural Development 2 (2):149-54. http://archive.aessweb.com/index.php/5005/article/view/518.