PUHAKKA, R. Nature tourists’ concern for the environment and response to ecolabels in Oulanka National Park. Nordia Geographical Publications, [S. l.], v. 39, n. 1, p. 27–38, 2010. Disponível em: https://nordia.journal.fi/article/view/75965. Acesso em: 24 nov. 2024.