Sidan YR, Sari MP. Development of Integrated Science Student Worksheets (LKPD) Based on a Scientific Approach on Environmental Pollution Material at SMPN 6 Padang Class VII. universe [Internet]. 2022 Jul. 31 [cited 2026 Jul. 26];3(1):57-62. Available from: http://universe.ppj.unp.ac.id/index.php/universe/article/view/160