Karolev, Vladimir, e Rossitza Ohridska Olson. 2017. «The Myth, Reality and Future of Tourists’ and Travel Industry Responsibilities: A Model for Sustainable Tourism in Protected Areas and Its Applications in Bulgari»a. Revista Turismo & Desenvolvimento 2 (27/28), 161-63. https://doi.org/10.34624/rtd.v2i27/28.8273.