Siregar, T., Semuel Franklyn Yawan, and R. C. Samosir. “E-MODULE OF CONTEXTUAL BASED CHEMISTRY IN INCREASING LEARNING ACTIVITY ON HYDROCARBON COMPOUND MATERIAL”. Jurnal Ilmu Pendidikan Indonesia, vol. 13, no. 1, Feb. 2025, pp. 45-54, doi:10.31957/jipi.v13i1.4571.