Bwala, M. A. ., and W. . Alani. “Comparative Profitability Analysis of Cowpea and Soybean Enterprises in Niger State of Nigeria”. Journal of the Bangladesh Agricultural University, vol. 18, no. 2, June 2020, pp. 471–478, https://banglajol.info/index.php/JBAU/article/view/73656.