Gunawan, W., A. Atiqoh, Y. . Wiyarno, S. Suharti, and R. D. . Rusmawati. “The Influence Of PBL Models, Demonstrations And Initial Knowledge On Increasing Learning Achievement”. Education Journal : Journal Educational Research and Development, vol. 7, no. 2, Jan. 2024, pp. 268-79, doi:10.31537/ej.v7i2.1287.