MILEV, O.; VÁZQUEZ, J. L.; IVANOVA, D.; GEORGIEV, I. Innovative strategies in the management of alternative tourism. Responsibility and Sustainability, [S. l.], v. 2, n. 1, p. 65–70, 2014. Disponível em: https://responsibility-sustainability.org/index.php/R-S/article/view/30. Acesso em: 23 apr. 2026.