Aga, F. J. . “Active Learning Versus the Traditional Lecture Methods of Teaching at Higher Education Institutions: A Case Study of Learners’ Preferences at the Department of Business Education, Addis Ababa University”. The Ethiopian Journal of Education, vol. 25, no. 1, June 2005, pp. 49-77, http://213.55.95.79/index.php/EJE/article/view/11019.