Kuntari, F. R., F. S. Rondonuwu, and D. N. Sudjito. “Understanding by Design (UbD) for the Physics Learning about Parabolic Motion”. Jurnal Penelitian Fisika Dan Aplikasinya (JPFA), vol. 9, no. 1, June 2019, pp. 32-43, doi:10.26740/jpfa.v9n1.p32-43.