Tina, W.A. et al. 2021. Child Hand Washing Intervention (Age < 5 Years) Against The Risk of Infection in Child Care: Systematic Review. STRADA : Jurnal Ilmiah Kesehatan. 10, 1 (May 2021), 283–293. DOI:https://doi.org/10.30994/sjik.v10i1.622.