H. S. Nasution and Fithriani, “The Relationship between Covid-19 Pandemic Anxiety and Expenditures for Postpartum Mother’s Breastfeeding at the Air Joman Baru Sub-Health Center, Air Joman District, Asahan Regency Year 2021”, midwifery, vol. 10, no. 5, pp. 3748–3758, Nov. 2022.