Yamasmit, W., S. Armarttasn, and J. Lorwatthanasirikul. “Conservative Management of Placental Adherence”. Vajira Medical Journal : Journal of Urban Medicine, vol. 52, no. 2, Sept. 2011, pp. 175-81, https://he02.tci-thaijo.org/index.php/VMED/article/view/345.