Jareonrattanadaechakul, N., and W. Sukhupragarn. “The effectiveness of guide charts for visual estimation of intraoperative blood loss for anesthesia providers at Maharaj Nakorn Chiang Mai Hospital”. Thai Journal of Anesthesiology, vol. 43, no. 1, Mar. 2017, pp. 27-39, https://he02.tci-thaijo.org/index.php/anesthai/article/view/92223.