«GEOTOURISM IN THE NIŠAVA RIVER MIDSTREAM VALLEY, SOUTHEASTERN SERBIA – CURRENT STATE AND ISSUES OF FUTURE DEVELOPMENT». REVISTA GEOGRÁFICA ACADÊMICA 9, no. 2 (diciembre 10, 2015): 94–106. Accedido octubre 28, 2026. https://revista.ufrr.br/rga/article/view/3060.