Hanin, Fauziah.
" ENVIRONMENTAL CONCEPT BASED PjBL (PROJECT BASED LEARNING) MODELS TO INCREASE THE OBSERVATION SKILLS OF VII GRADE STUDENTS AT SMPN 1 JENANGAN PONOROGO." <em>SEMESTA: Journal of Science Education and Teaching</em> [Online], 3.1 (2020): 50-58. Web. 14 May. 2024