Handayani ND, Djukri. Development of Electronic Student Worksheet Based on Problem-Based Learning for Material on Environmental Change Geoheritage Gumuk Pasir. jppipa, pendidikan ipa, fisika, biologi, kimia [Internet]. 2024 May 25 [cited 2024 Jul. 1];10(5):2438-45. Available from: https://jppipa.unram.ac.id/index.php/jppipa/article/view/7283