Pasek, Ari D., N. P Tandian, A Suwono, T Hardianto, and T. A Fauzi Soelaiman. 2017. “Indonesian Experiences in Retrofitting of Some Milk Cooler Systems”. Mesin 14 (2):1-6. https://journals.itb.ac.id/index.php/jtms/article/view/4845.