Z. B. BAYSAL, et al. “PERSONALITY CHARACTERISTICS AND PSYCHOLOGICAL SYMTOM PROFILES OF PATIENTS WITH PEPTIC ULCUS”. Turkish Journal of Gastroenterology, vol. 4, no. 1, Apr. 2020, pp. 115-7, https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/322.