E. Asda, E. Effendi, A. Maaruf, H. Fathony, and I. Hidayati, “The Validity of E-Learning Chemistry Learning in SMA / MA Project Based Learning on Hydrocarbons Using the Flipped Classroom Approach in Class XI Senior High School”, JHICE, vol. 2, no. 01, pp. 1-9, Jan. 2022.