Shrestha, I., N. Pradhan, and J. Sharma. “Factors Influencing Perception of Labor Pain Among Parturient Women at Tribhuvan University Teaching Hospital”. Nepal Journal of Obstetrics and Gynaecology, vol. 8, no. 1, Oct. 2013, pp. 26-30, https://nepjol.info/index.php/NJOG/article/view/8857.