Manurung, Sondang R, and Deo Demonta Panggabean. “IMPROVING STUDENTS’ THINKING ABILITY IN PHYSICS USING INTERACTIVE MULTIMEDIA BASED PROBLEM SOLVING”. Jurnal Cakrawala Pendidikan, vol. 39, no. 2, June 2020, pp. 460-7, doi:10.21831/cp.v39i2.28205.