Kittipibul , V. “Ultrasonographic Findings in Pregnant Women with Clinically Diagnosed Threatened Abortion at Maharat Nakhon Ratchasima Hospital”. Maharat Nakhon Ratchasima Hospital Journal, vol. 24, no. 2, Oct. 2024, pp. 61-68, https://he04.tci-thaijo.org/index.php/MNRHJ/article/view/2235.