Piyamongkol, W., Tongsong, T., & Apininbongkode, S. (1996). The Amniotic Fluid Index in Normal Pregnant Women. Thai Journal of Obstetrics and Gynaecology, 8(4), 287–290. retrieved from https://he02.tci-thaijo.org/index.php/tjog/article/view/258778