Ivanović, Vladan, Marko Gašić, and Miodrag Simijonović. “B2B E-COMMERCE IN TOURISM”. BizInfo Blace 4, no. 2 (December 29, 2013): 65–78. Accessed August 9, 2026. https://bizinfo.edu.rs/index.php/bizinfo/article/view/52.