Muphimin, Muphimin, and Delila Rambe. “Analisis Strategi Bersaing Penjual Ponsel Di Jakarta:Kajian Berdasarkan Five Forces Porter”. Jurnal Akademi Akuntansi Indonesia Padang, vol. 5, no. 1, Apr. 2025, pp. 1-12, https://doi.org/10.31933/fg5b0x47.