Rahmawati, A.V. and Muchlis, M. 2025. The Effectiveness of Student Worksheet with Problem Based Learning and Ethnoscience to Improve Critical Thinking Skills on Chemical Bonding Material: -. PENDIPA Journal of Science Education. 9, 2 (May 2025), 264–270. DOI:https://doi.org/10.33369/pendipa.9.2.264-270.