Syafei, S., S. Sausan, H. Afifah, E. Efliani, and G. Gunella. “Validity E-Learning of Chemistry Learning Based on PjBL (Project Based Learning) Model for Thermochemistry Material With Flipped Classroom Approach for Eleventh Grade High School”. INTERNATIONAL JOURNAL OF HIGH INFORMATION, COMPUTERIZATION, ENGINEERING AND APPLIED SCIENCE (JHICE), Vol. 2, no. 01, Jan. 2022, pp. 28-35, doi:10.24036/jhice/vol2-iss01/18.