Thinyounyong, W., Sahamethapat, K. and Tadadej, C. (2017) “Trends and Causes of Maternal Mortality in Phetchabun Province during 2003-2014”, Vajira Medical Journal : Journal of Urban Medicine, 60(1), pp. 33–42. available at: https://he02.tci-thaijo.org/index.php/VMED/article/view/100314 (accessed: 6 April 2025).