Nurhidaya, Nurhidaya, et al. “The Correlation Between Knowledge and Attitude About Covid-19 With Compliance With the Use of Masks at Masombamarket”. International Journal of Health, Economics, and Social Sciences (IJHESS), vol. 3, no. 4, Oct. 2021, pp. 267-73, doi:10.56338/ijhess.v3i4.1900.