Nasution, Herlia Sumardha. “THE RELATIONSHIP OF KNOWLEDGE AND ATTITUDE OF PREGNANT MOTHERS ABOUT THE BENEFITS OF ULTRASOUND ON THEIR PREGNANCY AT THE SILAU LAUT PUSKESMAS, SILAU LAUT DISTRICT IN 2021”. Science Midwifery 10, no. 2 (April 30, 2022): 1816–1820. Accessed June 18, 2026. https://midwifery.iocspublisher.org/index.php/midwifery/article/view/501.