Netjaroen, S., W. Hengcharoen, and N. Wisetsopa. “Effect of Kefir Grain with Some Enzyme to Milk Protein Sedimentation in Mozzarella Cheese Process”. Institute of Vocational Education Southern Region 3 Journal (KRIS Journal), vol. 1, no. 1, June 2021, pp. 120-31, https://so08.tci-thaijo.org/index.php/KRIS/article/view/3158.