Elsinah, Elsinah, Zahruddin Zahruddin, and Maftuhah Maftuhah. 2022. “Analysis of Porter’s Five Strengths in SD Shopos Indonesia”. Cendikia : Media Jurnal Ilmiah Pendidikan 13 (6):1033-41. https://doi.org/10.35335/cendikia.v13i6.3836.