LÉGRÁDI , Miklós. Topics in the Research of E-book Usage and the Applicable Findings of it for Product Development. International Journal of Engineering and Management Sciences, [S. l.], v. 5, n. 1, p. 453–479, 2020. DOI: 10.21791/IJEMS.2020.1.38. Disponível em: https://ojs.lib.unideb.hu/IJEMS/article/view/5675.. Acesso em: 17 jul. 2024.