Muenphon, S., P. Wiroonboonpat, S. Kumsai, M. Homchan, A. Submark, P. Dissara, N. Tianmanee, D. Suvagandha, and S. Vongsheree. “Factors Affecting the Number of Nonconformities from the Assessment of Safety in Medical Laboratory According to ISO 15190:2003”. Journal of Associated Medical Sciences, vol. 49, no. 2, May 2016, p. 255, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/59890.