Anwar, S., T. Wahyudi, M. Andriani, D. Maulina, J. Fitri, R. Nora, and Z. Zulfazli. “Service Waiting Time Behavior of Express Maintenance (EM) Program of PT. Dunia Barusa Banda Aceh”. Jurnal Matematika, Statistika Dan Komputasi, vol. 16, no. 3, Apr. 2020, pp. 247-62, doi:10.20956/jmsk.v16i3.4927.