Pranudta, S., and S. Anusornteerakul. “The Effect of Acupressure at Yongquan Point to Relief Pain and Duration of the First Stage of Labour”. Journal of Phrapokklao Nursing College, Chanthaburi, vol. 30, no. 2, June 2019, pp. 173-84, https://he01.tci-thaijo.org/index.php/pnc/article/view/189762.