Muflihah, M., Supardi, K.I. and Sumarni, W. 2020. Concept Understanding Analysis of Coloid Materials After Application of Joyful Learning Problem Based Learning. Journal of Innovative Science Education. 9, 3 (Dec. 2020), 306 - 313. DOI:https://doi.org/10.15294/jise.v9i1.36713.