Husna I, Mulyana Harnas D, Gusman F, Gusman E, Refman Adrus SE. Prototype Validity Of Content Learning System (CLS) on Atomic Structure Material Based on Project Based Learning (PjBL) Using Flipped Classroom With Moodle For High School Students In Indonesia. JHICE [Internet]. 30Jun.2021 [cited 21Sep.2024];1(01):34-5. Available from: http://jhice.ppj.unp.ac.id/index.php/jhice/article/view/36