1. Geothermal Heat Pumps http energy gov energysaver articles geothermal heat pumps;USDOE,2013
2. Geothermal Technologies Program At The Department of eere energy gov geothermal heatpumps html;EERE;Energy,2014
3. of and Air Mechanic course Professional Technical School;Apostille;Refrigeration Conditioning Advanced,2012
4. Six of the highest temperatures in the world today have been registered in Rio Globe globo com in oglobo globo com ciencia seis das temperaturas maisaltas do mundo hoje foram registradas no rio;Ackermann;Science,2014
5. Ground Source Heat Pumps : Overview of Market Status Barriers to Adoption and Options for Overcoming Barriers Final report of USDOE eere energy gov geothermal pdfs gshp overview pdf;EERE,2009