Okpala, Comfort O., and Amon O. Okpala. “Cooperative Learning Structure: Catalyst for Effective Learning for Adult Learners in Higher Education”. Contemporary Issues in Education Research (CIER) 7, no. 4 (September 16, 2014): 259–268. Accessed July 17, 2024. https://clutejournals.com/index.php/CIER/article/view/8839.