Aristyani, Karennina, and Siti Hidayati. 2020. “VALIDITY OF SCIENCE BOOK ORIENTED SETS IN ENVIRONMENTAL POLLUTION MATERIAL FOR JUNIOR HIGH SCHOOL STUDENTS”. PENSA: E-JURNAL PENDIDIKAN SAINS 8 (2), 174-77. https://ejournal.unesa.ac.id/index.php/pensa/article/view/38347.