Triped, Orawin, and Sakda Arj-Ong. 2012. “Maternal Risk Factors of Low Birth Weight at Maharat Nakornratchasima Hospital”. Thai Journal of Obstetrics and Gynaecology 20 (1). Bangkok, Thailand:12-20. https://he02.tci-thaijo.org/index.php/tjog/article/view/1092.