ANJANDE, G., V. U. IJIRSHAR, S. T. ASOM, S. E. AKIRI, and J. T. SOKPO. “REVISITING THE ACCURACY OF RICARDIAN THEORY OF COMPARATIVE ADVANTAGE IN AFRICA IN THE 21ST CENTURY: AN EMPIRICAL VERIFICATION”. JOURNAL OF ECONOMICS AND ALLIED RESEARCH, vol. 4, no. 3, Sept. 2020, pp. 25-44, http://jearecons.com/index.php/jearecons/article/view/169.