Validity Of Electronic Student Worksheets (E-LKPD) Problem-Based On Environmental Pollution Material. Marlajar: Journal of Science, Technology, and Innovation, [S. l.], v. 1, n. 1, p. 9–16, 2026. DOI: 10.66784/marlajar.v1i1.16. Disponível em: https://journal.taromboresearch.com/index.php/marlajar/article/view/16. Acesso em: 8 jun. 2026.