Mikhael Sihombing, Farihah, and Efendi Napitupulu. “Study of Effectiveness of Multimedia-Based Interactive Learning at Nila Harapan Deli Serdang Vocational High School”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE, vol. 4, no. 1, Jan. 2018, pp. 112-7, doi:10.7324/IJASRE.2018.32598.