Khwanmueang, Piyanut, Sopen Chunuan, and Benyapa Thitimapong. 2020. “Effect of Childbirth Preparation Program With Continuous Labor Support on Labor Pain of First-Time Teenage Pregnant Women”. Nursing Journal of The Ministry of Public Health 30 (3):115-27. https://he02.tci-thaijo.org/index.php/tnaph/article/view/248456.