Kovačić, Nataša, und Hrvoje Grofelnik. „The impact of tourism on the environment in legally protected areas – a study of the connection between the carbon footprint of road traffic and tourism using the example of the Učka tunnel in the Učka nature park“. In Turizam i zaštićena područja: zbornik radova sa znanstvenog kolokvija, herausgegeben von Nikola Bašić und Josip Faričić, 163–181. Morepress Books, 2025. Zugegriffen September 5, 2026. https://morepress.unizd.hr/books/index.php/press/catalog/book/138/chapter/850.