Samakeenit, B., P. Saksiriwuttho, T. Ratanasiri, and R. Komwilaisak. “Amniotic Fluid Index (AFI) for Normal Pregnant Women in Northeastern Thailand”. Thai Journal of Obstetrics and Gynaecology, vol. 23, no. 1, Mar. 2015, pp. 12-17, doi:10.14456/tjog.2015.2.