Mahmudah, Mahmudah, Munzil Munzil, and Erni Yulianti. 2018. “Validity and Reliability Study of Science-Edutainment Interactive Multimedia on Earth Topic for the 7th Graders of Junior High Schools”. Jurnal Penelitian Fisika Dan Aplikasinya (JPFA) 8 (1):42-50. https://doi.org/10.26740/jpfa.v8n1.p42-50.