Mohammad Fahrizal Ardiyansyah, and Arief Senja Fitrani. “Sales Management System in Grocery Store Mobile Phone Based: Sistem Manajemen Penjualan Di Toko Kelontong Berbasis Ponsel”. Procedia of Engineering and Life Science, vol. 1, no. 1, Mar. 2021, doi:10.21070/pels.v1i1.830.