Thongma, S., and S. Kanaprad. “Prenatal Diagnosis of the Arnold-Chiari Malformation with Spina Bifida : A Case Report”. Thai Journal of Obstetrics and Gynaecology, vol. 8, no. 1, Jan. 1996, pp. 47-50, https://he02.tci-thaijo.org/index.php/tjog/article/view/257710.