Buayaem, T., P. Yapan, and S. Pongprasobchai. “Nursing Care for Pregnant Woman at Risk for Preterm Labour”. Nursing Research and Innovation Journal, vol. 25, no. 3, Jan. 2020, pp. 243-54, https://he02.tci-thaijo.org/index.php/RNJ/article/view/166041.