Para, Suparak. 2019. “Factors Influencing Pregnancy Rate in Intrauterine Insemination Among Infertile Couple: A Study in the Fertility Center, Thammasat University Hospital”. Thammasat University Hospital Journal Online 4 (2). Pathum Thani, Thailand:32-46. https://he02.tci-thaijo.org/index.php/TUHJ/article/view/240365.