“NEED ANALYSIS OF DIGITAL TEACHING MATERIALS WITH STEM APPROACH AND FLIP BOOK-FORMED TO IMPROVE SELF-REGULATED SKILLS FOR PRE-SERVICE TEACHERS”. SPEKTRA: Jurnal Kajian Pendidikan Sains, vol. 10, no. 2, Sept. 2024, pp. 185-9, https://doi.org/10.32699/spektra.v10i2.7732.