Cattleya Mukdee และ Thitima Suntharasaj; Chusana Petpichetchian. (2021) Prediction of Successful Normal Vaginal Delivery by Ultrasonographic Measurement of Occiput-Spine Angle during First Stage of Labor. <i>Thai Journal of Obstetrics and Gynaecology</i>, <i>29</i>(5), 288-297.Cattleya Mukdee และ Thitima Suntharasaj; Chusana Petpichetchian. "Prediction of Successful Normal Vaginal Delivery by Ultrasonographic Measurement of Occiput-Spine Angle during First Stage of Labor". Thai Journal of Obstetrics and Gynaecology 29 (2021):288-297.Cattleya Mukdee และ Thitima Suntharasaj; Chusana Petpichetchian. Prediction of Successful Normal Vaginal Delivery by Ultrasonographic Measurement of Occiput-Spine Angle during First Stage of Labor. PIMDEE Co. Ltd.:ม.ป.ท. 2021.