Taveekaew, C., K. Bouban, and S. Ketkaew. “Coping With Pain in The First Stage of Labour and The Role of Midwifery in The New Dimension”. Vajira Medical Journal : Journal of Urban Medicine, vol. 63, no. 3, June 2019, pp. 231-8, https://he02.tci-thaijo.org/index.php/VMED/article/view/211776.