The Relationship Between Merchants Knowledge and Attitude Toward the Obedience of Mask Use in Preventing Covid-19. International Journal of Advanced Health Science and Technology, [S. l.], v. 2, n. 1, p. 1–6, 2022. DOI: 10.35882/ijahst.v2i1.1. Disponível em: https://ijahst.org/index.php/ijahst/article/view/10. Acesso em: 16 aug. 2025.