1. Carslaw, H. S.; Jaeger J. C. 1946. Conduction of Heat in Solids, Oxford,Claremore Press.
2. Ingersoll, L.R.; Zobel, O.J.; Ingersoll, A.C. 1954. Heat Conduction with Engineering, Geological and Other Applications. Madison, WI: The University of Wisconsin Press.
3. Kavanaugh, S.P.; Rafferty, K. 1997. Ground-source Heat Pumps: Design of Geothermal Systems for Commercial and Institutional Buildings. American Society of Heating, Refrigeration and Airconditioning Engineers, Inc., Atlanta, GA.
4. Determining Of Undisturbed Ground Temperature As The Part Of Shallow Geothermal Resources Assessment, The Mining-Geological-Petroleum Bulletin, Faculty of Mining;Kurevija;Geology and Petroleum Engineering,2010