SANTONG, K., W. CHUNGLOK, M. LERTCANAWANICHAKUL, and P. BANGRAK. “Screening and Isolation of Bacillus Sp. Producing Thermotolerant Protease from Raw Milk”. Walailak Journal of Science and Technology (WJST), vol. 5, no. 2, Nov. 2011, pp. 151-60, https://wjst.wu.ac.th/index.php/wjst/article/view/85.