Maneechotwong, N., P. Theerasopon, S. Muangpin, R. Jonrapun, S. Songjun, and S. Khumhirun. “Effect of Foot Reflexology on Pain Reduction of the First Stage of Labor Among Primiparous”. Journal of Health Science of Thailand, vol. 26, no. 3, Oct. 2017, pp. 533-42, https://thaidj.org/index.php/JHS/article/view/59.