Uahgowitchai, P., C. Uahgowitchai, S. Disornpong, and S. Chansorn. “Family Status and Changing Workplace of Songkhla Commercial Sex Workers”. Journal of Health Science of Thailand, vol. 3, no. 4, Dec. 1994, pp. 293-02, https://thaidj.org/index.php/JHS/article/view/6623.