ISLAMIATI, Fitri Nur. Project-Based Learning (PjBL) Worksheet on the Production of Whey Kefir Paper Soap. JTK (Jurnal Tadris Kimiya), [S. l.], v. 8, n. 1, p. 21–29, 2023. DOI: 10.15575/jtk.v8i1.25219. Disponível em: https://journal.uinsgd.ac.id/index.php/tadris-kimiya/article/view/25219. Acesso em: 6 dec. 2025.