Manalu A, Simamora A, Purba ID, Sinaga N. The Effectiveness of Problem Based Learning Model on Understanding Concepts and Science Process Skills As Implementation Independent Curriculum. ISIHUMOR [Internet]. 2026 Apr. 30 [cited 2026 May 25];4(2):633-41. Available from: https://putrapublisher.org/index.php/isihumor/article/view/1679