Hadiningrum, L.P. 2019. USING COOP-COOP METHOD TO IMPROVE THE STUDENTS’ NATURAL SCIENCE LEARNING COMPETENCES. Lentera Pendidikan : Jurnal Ilmu Tarbiyah dan Keguruan. 22, 2 (Dec. 2019), 311-322. DOI:https://doi.org/10.24252/lp.2019v22n2i13.