Pakpahan, Nurmi Frida Dorintan Bertua. 2022. “THE EFFECTIVENESS OF ACHIEVE STUDENT COMPETENCY BETWEEN LEARNING USING VIDEO-BASED MEDIA AND POWER POINTS IN ENVIRONMENTAL SCIENCE COURSES”. International Online Journal of Education and Teaching 9 (1):604-11. https://www.iojet.org/index.php/IOJET/article/view/1593.