Muninda, Y. S., Pantiwati, Y., Purwanti, E., & Permana, T. I. (2021). "Liver as excretory organ": Developing Android-based flash learning media for middle school students. Research and Development in Education (RaDEn), 1(2), 86–97. https://doi.org/10.22219/raden.v1i2.19033