Wahyudi, E. et al. 2020. (RETRACTED) APPLICATION OF BILLING SYSTEMS IN CONTAINER DEPOT: IN PT KAWASAN INDUSTRI MEDAN. POSITIF : Jurnal Sistem dan Teknologi Informasi. 6, 1 (Jun. 2020), 29–37. DOI:https://doi.org/10.31961/positif.v6i1.779.