M. T. Sumanty and T. Turdjai, “IMPLEMENTATION OF DISCOVERY LEARNING MODELS TO IMPROVE THE ABILITY OF SOLVING PROBLEMS AND LEARNING ACHIEVEMENTS (Study on Chemistry Subject Class XII Students in Senior High School 1 Tebing Tinggi)”, Diadik j. ilm. teknol. pendidik., vol. 8, no. 2, pp. 71–81, Aug. 2021.