Syopiani Oktavia et al. 2021. DEVELOPING WOPIPOPU (WORDLESS PICTURE POP-UP) BOOK MEDIA ON SCIENTIFIC LEARNING AT GRADE 4 ELEMENTARY SCHOOL. Primary: Jurnal Pendidikan Guru Sekolah Dasar. 10, 3 (Jun. 2021), 669–679. DOI:https://doi.org/10.33578/jpfkip.v10i3.8142.