M. Pase, “The Relationship between Knowledge and Anxiety Levels of Midwives in Providing Delivery Assistance in the Era of the Covid-19 Pandemic At Upt Health Center Seibamban Kec. Batang Serangan Langkat Regency in 2021”, midwifery, vol. 10, no. 2, pp. 1835–1842, Apr. 2022.