Dewi, A. K., N. Asyhab, A. S. Yazid, and A. Mulyanto. “Design and Implementation of Web-Based E-Learning With W3C Standardization”. IJID (International Journal on Informatics for Development), vol. 2, no. 1, May 2013, pp. 19-29, doi:10.14421/ijid.2013.02104.