Ndruru HMP, Sormin E, Purba LSL, Simanjuntak FN. Development of Environmentally Based E-STUDENT WORKSHEET for Chemistry Practices. J. Sci. Educ. [nternet]. 2026Jan.19 [cited 2026Oct.7];6(2):1381-93. vailable from: https://jse.rezkimedia.org/index.php/jse/article/view/637