T. U. ZAMAN. EFFECTIVENESS OF PRE-LABS AT SECONDARY SCHOOL LEVEL CHEMISTRY LAB. Pakistan Journal of Science, [S. l.], v. 64, n. 1, 2022. DOI: 10.57041/vol64iss1pp%p. Disponível em: https://pjosr.com/index.php/pjs/article/view/457. Acesso em: 14 may. 2026.