Abeysinghe, A., B. Jayatilleke, B. C. L. Athapattu, and L. Gamini. “Historical Perspectives on Costing of ODL Courses: Re-Evaluate the Implement at the Open University of Sri Lanka”. Advances in Social Sciences Research Journal, vol. 3, no. 13, Dec. 2016, doi:10.14738/assrj.313.2548.