Thuchart, Siwaporn, Usavadee Asdornwised, Wanpen Pinyopasakul, and Auttaporn Trakarnsanga. “The Effects of Concrete-Objective Information Program on Pre-Operative Anxiety in Abdominal Surgery Patients”. Nursing Science Journal of Thailand 37, no. 2 (May 27, 2019): 78-91. Accessed November 15, 2019. https://www.tci-thaijo.org/index.php/ns/article/view/192756.