Prarom, S., Suntornlimsiri, W. and Sittijumlong, O. (2017) “Comparison of Cost Efficiency of Olive Oil, Gel-Olive Oil Mixed and Gel as a Sound Media for External Electronic Fetal Monitor”, Journal of Health Science of Thailand, 23(5), pp. 870–878. Available at: https://thaidj.org/index.php/JHS/article/view/770 (Accessed: 5December2025).