Yulianita, Neni, Tri Jalmo, and Abdurrahman Abdurrahman. 2018. “DEVELOPING A VIRTUAL LABORATORY FOR THE MATERIALS ON OPTICS TO INCREASE JUNIOR HIGH SCHOOL STUDENTS’ LEARNING OUTCOMES”. Journal of Science Education Research 2 (2):80-84. https://doi.org/10.21831/jser.v2i2.22478.