Sriwichai, P., K. Sajai, and J. Saklaw. “Predicting Factors of Pain and Pain Management Behaviors in Working-age Patients undergoing Major Abdominal Surgery”. Journal of The Royal Thai Army Nurses, vol. 24, no. 2, Sept. 2023, pp. 88-97, https://he01.tci-thaijo.org/index.php/JRTAN/article/view/262692.