NIEZGODA, Agnieszka. Problems of implementing sustainable tourism in Poland. Economics and Business Review, Poland, v. 4, n. 1, p. 30–42, 2004. DOI: 10.18559/ebr.2004.1.501. Disponível em: https://journals.ue.poznan.pl/ebr/article/view/501. Acesso em: 3 apr. 2025.