D. E. Marcial, R. D. B. Caballero, J. B. Rendal, and G. A. Patrimonio, “‘I AM OFFLINE’: MEASURING BARRIERS TO OPEN ONLINE LEARNING IN THE PHILIPPINES”, ITLT, vol. 45, no. 1, pp. 28–41, Feb. 2015, doi: 10.33407/itlt.v45i1.1170.