Ungureanu, A., and A. Jean Vasile. “TERTIALIZATION OF A TRANSITIONAL ECONOMY - AN OVERVIEW OF ROMANIAN TOURISM DURING 2005-2015”. Tourism International Scientific Conference Vrnjačka Banja - TISC, Vol. 2, no. 2, June 2017, pp. 518-37, http://www.tisc.rs/proceedings/index.php/hitmc/article/view/117.