S. Kritcharoen, P. Pongpaiboon, K. Phon-In, W. Chatchawet, P. Keawpimon, and S. Maksuwan, “Effectiveness of Continuous Labor Support from Village Health Volunteers on Pain and Duration of Labor Among Primiparous Women”, JRN-MHS, vol. 39, no. 4, pp. 16–25, Dec. 2019.