Zuyina, Alsa Vika, and Wahono Widodo. “VALIDITY OF ETHNOSCIENCE BOOKLET MEDIA IN THE REGION OF PONOROGO ON SOUND WAVE SUB MATERIAL”. PENSA: E-JURNAL PENDIDIKAN SAINS, vol. 8, no. 2, July 2020, pp. 178-82, https://ejournal.unesa.ac.id/index.php/pensa/article/view/38360.