CIVELEK, M.; GAJDKA, K.; SVĚTLÍK, J.; VAVREČKA, V. Differences in the usage of online marketing and social media tools: evidence from Czech, Slovakian and Hungarian SMEs. Equilibrium. Quarterly Journal of Economics and Economic Policy, [S. l.], v. 15, n. 3, p. 537–563, 2020. DOI: 10.24136/eq.2020.024. Disponível em: http://economic-research.pl/Journals/index.php/eq/article/view/1810. Acesso em: 22 mar. 2023.