GOSZTONYI, C. Eladni, eladni, eladni!. Marketing & Menedzsment, [S. l.], v. 39, n. 3, p. 3, 2019. Disponível em: https://journals.lib.pte.hu/index.php/mm/article/view/1432. Acesso em: 3 máj. 2024.