jadranka.djurovic@eknfak.ni.ac.rs
marina.dj@ptt.rs
vlahmari@uns.ac.rs
© 2017 Jadranka Đurović-Todorović, Marina Đorđević, Marija Vuković, published by University of Niš, Faculty of EconomicsThis work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.