Soufitri, Fithrie, and Ellanda Purwawijaya. “Analisis Kualitas Rancangan Point of Sale Menerapkan Metode Mean Squared Error”. JURNAL MEDIA INFORMATIKA BUDIDARMA, vol. 6, no. 4, Oct. 2022, pp. 2376-82, doi:10.30865/mib.v6i4.4767.