A. M. P. B. Abeysinghe, 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”, IJSBAR, vol. 24, no. 1, pp. 37–50, Jul. 2015.