PIECHOTA, Grażyna. Managing of communication processes in social media by the cities of Metropolitan Association of Upper Silesia and their majors. Journal of Public Governance, [S. l.], v. 22, n. 4, p. 52–67, 2013. Disponível em: https://publicgovernance.pl/zpub/article/view/247. Acesso em: 27 apr. 2024.