Kittipibul , Verapol. “Ultrasonographic Findings in Pregnant Women with Clinically Diagnosed Threatened Abortion at Maharat Nakhon Ratchasima Hospital”. Maharat Nakhon Ratchasima Hospital Journal 24, no. 2 (October 22, 2024): 61–68. accessed April 10, 2025. https://he04.tci-thaijo.org/index.php/MNRHJ/article/view/2235.