Pertiwi, A. Y., S. M. E. S. Sri Mulyani Endang Susilowati, and K. Khumaedi. “Learning Motivation and Students’ Critical Thinking Ability in Science Learning through a Problem Based Learning Model Assisted by Video Media”. Journal of Primary Education, Vol. 8, no. 7, Sept. 2019, pp. 64-74, doi:10.15294/jpe.v10i1.34028.