Widarti, Hayuni Retno, Deni Ainur Rokhim, and Muchammad Musleh Kadafi. “Android-Based Project-Based Learning Integrated Gravimetric Analysis for Chemical Expertise Analysis of Vocational School: Development of Teaching Materials”. IJCER (International Journal of Chemistry Education Research) 7, no. 2 (October 25, 2023): 93–104. Accessed May 13, 2024. https://journal.uii.ac.id/IJCER/article/view/28343.