Igbinovia, E. L., and D. O. Ogbeide. “Measuring the Efficiency of Selected Quoted Agricultural Firms in Nigeria: Data Envelopment Analysis (DEA) Approach”. Nigerian Academy of Management Journal, vol. 13, no. 1, Oct. 2018, pp. 60-70, https://namj.tamn-ng.org/index.php/home/article/view/87.