CETLOVÁ, H.; MARCINÍK, R.; VELINOV, E. Research into online marketing activities and tools for measuring their efficiency by entrepreneurs in the czech republic. Socio-Economic and Humanities Studies, [S. l.], v. 11, n. 1, p. 41–54, 2020. DOI: 10.61357/sehs.v11i1.47. Disponível em: http://sehs.ambis.cz/index.php/sehs/article/view/47. Acesso em: 8 sep. 2024.