BOBER , Piotr. Trends of the Tourism Sector. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 4, n. 2, p. 216–229, 2016. DOI: 10.18559/SOEP.2016.2.9. Disponível em: https://www.journals.ue.poznan.pl/soep/article/view/3413. Acesso em: 12 nov. 2026.