Kongpitee, K. . ., D. . Augsornwan, W. . . Setwong, N. . . Boonrueng, and P. . Surakulprapa. “Incidence and Predictive Factors for Post-Operative Delirium Among Older People”. Srinagarind Medical Journal, vol. 35, no. 2, Apr. 2020, pp. 193-8, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/241480.