SCHMIDT DI FRIEDBERG, M. The Sustainable Tourism Debate: Vernazza According To Rick Steves. Bollettino della Società Geografica Italiana, [S. l.], p. 535–548, 2001. DOI: 10.36253/bsgi-2662. Disponível em: https://www.bsgi.it/index.php/bsgi/article/view/2662. Acesso em: 15 oct. 2026.