B. Vuković, D., N. A. Shpak, M. M. Radovanović, A. Portugal Duarte, and D. Radulović. “THE ROLE OF HUMAN RESOURCES ON THE ECONOMY: A STUDY OF THE BALKAN EU MEMBER STATES”. Journal of the Geographical Institute “Jovan Cvijić” SASA, vol. 65, no. 2, Aug. 2015, pp. 253-68, doi:10.2298/IJGI1502123V.