A. W. . Rafisa, H. S. . Al-Fauziah, and N. Nurbaiti, “Influence of Pos Giro Mobile (PGM) in Running the Service Process of PT. Pos Indonesia (Case Study at Padangsidimpuan Post Office)”, j.emak, j.emak, vol. 3, no. 1, pp. 103–109, Jan. 2022.