Piyamongkol, Wirawit, Theera Tongsong, and Surached Apininbongkode. 1996. “The Amniotic Fluid Index in Normal Pregnant Women”. Thai Journal of Obstetrics and Gynaecology 8 (4). Bangkok, Thailand:287-90. https://he02.tci-thaijo.org/index.php/tjog/article/view/258778.