senita, ari, & Putra, A. (2021). DEVELOPMENT OF LKPD MODEL DISCOVERY LEARNING ACTIVITY ORIENTED CRITICAL THINKING ON VIBRATION MATERIALS, WAVES, AND SOUND FOR LEARNING IPA CLASS VIII IN JUNIOR HIGH SCHOOL 13 PADANG. Universe, 2(1), 18-24. https://doi.org/10.24036/universe.v2i1.34