Lasmawanti, Sri, and Veronica Anggreni Damanik. “Factors Related to Giving Formula Milk to Infants 0-6 Months in Pangurabaan Village, Sipirok District, South Tapanuli Regency in 2020”. Science Midwifery, vol. 9, no. 2, Apr. 2021, pp. 394-02, https://midwifery.iocspublisher.org/index.php/midwifery/article/view/119.