Rahman, Muliadi, Agus Ramdani, and Jamaluddin Jamaluddin. 2021. “The Validity of Science Learning Devices Based on the 7E Learning Cycle Model to Improve Concept Mastery of Junior High School Students”. Prisma Sains : Jurnal Pengkajian Ilmu Dan Pembelajaran Matematika Dan IPA IKIP Mataram 9 (1):108-13. https://doi.org/10.33394/j-ps.v9i1.3976.