MARSINA, Štefan - ORAVSKÝ, Pavol. Utilization of Geothermal Energy as a Renewable Source. In Prace naukowe Universitetu Ekonomicznego we Wrocławiu. - Wrocław : Publishing House of Wrocław University of Economics, 2014. ISSN 1899-3192, 2014, nr. 334, s. 141-148.