Hamani, N.A. and Hidayati, S.N. 2021. VALIDITY OF STUDENT WORKSHEET BASED ON ROLE PLAYING IN HUMAN EXCRETORY SYSTEM MATERIAL TO IMPROVE MOTIVATION AND LEARNING OUTCOMES. PENSA E-JURNAL: PENDIDIKAN SAINS. 9, 1 (Jan. 2021), 90–95. DOI:https://doi.org/10.26740/pensa.v9i1.38507.