1. Environmental Protection Agency, 2021. How the 1-100 ENERGY STAR score is calculated. Portfolio Manager Technical Reference: ENERGY STAR Score. EPA, Washington, DC, pp.1-14.
2. American Society of Heating, Refrigeration & Air-Conditioning Engineers (ASHRAE), Investigation of methods for determining soil formation thermal characteristics from short term field tests, ASHRAE (RP-1118), Atlanta, 2001, pp.1-86.
3. Introduction to the Mathematical Theory of the Conduction of Heat in Solids;Carslaw,1945
4. Heat Conduction, with Engineering, Geological, and Other Applications;Ingersoll,1954
5. Simulation of vertical U-tube ground-coupled heatpump systems using the cylindrical heat source solution;Deerman;ASHRAE Trans.,1991