Abeysinghe, A. M. P. B., B. G. Jayatilleke, B. C. L. Athapattu, and L. P. S. Gamini. “Costing of a Blended Course at the Open University of Sri Lanka: An Empirical Study”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 24, no. 1 (July 29, 2015): 37–50. Accessed May 7, 2024. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4189.