Wasis Wicaksono, Galih, et al. “Development of Closed Distribution Monitoring System, Case Study: 3-Kg LPQ Distribution in Malang, Indonesia”. International Journal of Engineering & Technology, vol. 8, no. 1.9, Jan. 2019, pp. 354-8, https://doi.org/10.14419/ijet.v8i1.9.26685.