Sanusi, Asri, et al. “ Strategi Pemasaran Produk Paket Pos Kilat Khusus Pada PT. Pos Indonesia: Marketing Strategic of Express Product Packages at PT. Pos Indonesia”. BISMA Cendekia, vol. 1, no. 2, Jan. 2021, pp. 41-45, https://ojs.politeknikcendana.ac.id/index.php/bisma/article/view/10.