Ruangkitudom, N., V. Thiensukon, P. Bunnag, R. Chaiwong, V. Prachayakul, S. Amornyotin, and T. Akaraviputh. “Outcomes of a Structured Program for Bowel Preparation in Patients Scheduled to Undergo Colonoscopy: A Randomized Controlled Trial”. The Thai Journal of Surgery, vol. 39, no. 1, Mar. 2018, pp. 21-29, https://he02.tci-thaijo.org/index.php/ThaiJSurg/article/view/219933.