Pakpahan, Romauli. 2022. “Relationship Between Environmental Sanitation and Incidence of Diarrhea in Under-Frees in The Working Area of The Bandar Marsilam Puskesmas, Simalungun District”. Science Midwifery 10 (5):3924-27. https://doi.org/10.35335/midwifery.v10i5.1047.