Ljubisavljević, T., and M. Leković. “CONTEMPORARY SPA TOURISM DEVELOPMENT TRENDS WITH REFERENCE TO THE REPUBLIC OF SERBIA”. Tourism International Scientific Conference Vrnjačka Banja - TISC, Vol. 5, no. 1, Sept. 2020, pp. 215-30, https://tisc.rs/proceedings/index.php/hitmc/article/view/338.