Singhala, K., P. O-Prasertsawat, N. Saropala, and D. Sujirarat. “Factors Associated with Preeclampsia in Pregnant Women Admitted at Ramathibodi Hospital, 1994-1995”. Thai Journal of Obstetrics and Gynaecology, vol. 10, no. 1, Mar. 1998, pp. 21-26, https://he02.tci-thaijo.org/index.php/tjog/article/view/257112.