FERREIRA, M. R.; OLIVEIRA, J. A.; PŁASKOCIŃSKI, P. "Siepomaga.pl" and facebook as the most popular and simplest non-profit crowdfunding platform in Poland. Casos de marketing público y no lucrativo, [S. l.], v. 7, p. 65–72, 2020. Disponível em: https://casos-aimpn.org/index.php/casos/article/view/14. Acesso em: 6 jun. 2026.