Imran, A. “A Variable Neighborhood Search-Based Heuristic for the Multi-Depot Vehicle Routing Problem”. Jurnal Teknik Industri: Jurnal Keilmuan Dan Aplikasi Teknik Industri, vol. 15, no. 2, Dec. 2013, pp. 95-102, doi:10.9744/jti.15.2.95-102.