Charoenraj , L., C. Baosoung, and N. Sansiriphun. “Social Support, Uncertainty, and Coping Among Women With Preterm Labor”. Nursing Journal CMU, vol. 48, no. 1, Mar. 2021, pp. 222-33, https://he02.tci-thaijo.org/index.php/cmunursing/article/view/250255.