Boonpan, A., S. Pongswat, P. Pongthai, and S. Saijai. “The Effect of Chitosan on Quality and Extension of Shelf Life of Tofu”. Progress in Applied Science and Technology, vol. 1, no. 1, Aug. 2011, pp. 45-57, https://ph02.tci-thaijo.org/index.php/past/article/view/243263.