Piriyapun, K., and A. Pongpreecha. “Application of Geographic Information Systems for Route Optimization in Solid Waste Collection Using the Vehicle Routing Problem (VRP) Method: A Case Study of Tha Kham Subdistrict Municipality, Bang Pakong, Chachoengsao Province”. Sripatum Review of Humanities and Social Sciences, vol. 25, no. 1, June 2025, pp. 153-70, https://so05.tci-thaijo.org/index.php/spurhs/article/view/277260.