Bungmek, Sukanya, Piyanun Limruangrong, and Wanna Phahuwatanakorn. 2023. “The Effectiveness of Childbirth Preparation Program on Self-Efficacy in Pain Coping, Pain Level, and Pain Coping Behavior in the First Stage of Labor among the First Time Mothers”. Journal of The Royal Thai Army Nurses 24 (1):201-10. https://he01.tci-thaijo.org/index.php/JRTAN/article/view/255836.