Petkova E. A New Model for Analysis of Customer Interaction Activities of City Tours Providing Organizations: Implementation to Selective Tours of Sofia, Bulgaria. turizam [Internet]. 25. April 2020. [citirano 20. Septembar 2026.];24(2). Dostupno na: https://test.aseestant.ceon.rs/index.php/turizam/article/view/24756