Wisanskoonwong, P. “Midwifery Partnership Between Midwives and Pregnant Women for Reducing Risk Factors of Preterm Birth”. Kuakarun Journal of Nursing, vol. 21, no. 1, Feb. 2015, pp. 34-44, https://he01.tci-thaijo.org/index.php/kcn/article/view/31193.