A. Yerni, Putri Ramadani, Nurainun, and Intan Agustin, “The Relationship Of Knowledge About Healthy And Clean Living Behavior With Attitude To Preventing The Transmission Of Covid 19 At Hujjaturrahmah Islamic Boarding School Tanjung Pura Langkat District In 2021”, midwifery, vol. 10, no. 1, October, pp. 675–781, Aug. 2022.