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Harefa, Nelius and Gulo, Arifman and Silaban, Saronom (2021) Analysis of BOD and COD levels for home industry wastewater: A case study in a sewage streams. Jurnal Pendidikan Kimia, 13 (1). ISSN 2549 3116
Harefa, Nelius and Sinaga, Marudut and Silaban, Saronom (2020) Students perception and interest on chemistry: Learning evaluation integrated quizziz media. Jurnal Pendidikan Kimia, 12 (3). pp. 143-150. ISSN 2549 3116