Syafrony, A. “A COMPARATIVE STUDY OF THE USE OF OPEN EDUCATIONAL RESOURCES (OER) AT E-LEARNING UNIVERSITY AND FACE-TO-FACE UNIVERSITY IN YOGYAKARTA (A CASE STUDY AT UT AND UNY)”. Jurnal Pendidikan Terbuka Dan Jarak Jauh, Vol. 20, no. 2, Jan. 2020, pp. 90-101, doi:10.33830/ptjj.v20i2.454.2019.