1. The effects of the elemental regional pattern on the soils chemical parameters ) Hungarian Geographical;Szalai;Bulletin,2008
2. Working Group WRB Reference Base for Soil Resources first update Soil Resources Reports No;IUSS;World World,2007
3. website http portal debrecen hu upload File Gazdasag koncepciok kornyezetvedelmi program
4. The heavy metal contents of the public places of Budapest;Kovács,1984
5. The examination of topsoils in Sopron and its area;Horváth;Landscape Ecology,2013