2022. Practicality of Contextual Learning Videos on Material Equality of Mass and Energy in Covid-19 Online Learning. Buana Pendidikan: Jurnal Fakultas Keguruan dan Ilmu Pendidikan Unipa Surabaya. 18, 1 (Feb. 2022), 143–152. DOI:https://doi.org/10.36456/bp.vol18.no1.a5243.