Djudin, Tomo, and Selvaraj Grapragasem. 2019. “The Use of Pictorial Analogy to Increase Students Achievement and Its Retention of Physics Lessons of Direct Current”. Jurnal Penelitian Fisika Dan Aplikasinya (JPFA) 9 (2):140-51. https://doi.org/10.26740/jpfa.v9n2.p140-151.