"Three Decades Of Passive Solar Heating and Cooling Lessons Learned". U.S. Department of Energy (DOE) Oak Ridge National Laboratory (ORNL) Buildings Technology - "Thermal Performance of the Exterior Envelopes of Whole Buildings Tenth International Conference". Archived from the original on 2008-01-25. Retrieved 2008-01-18.
"Three Decades Of Passive Solar Heating and Cooling Lessons Learned". U.S. Department of Energy (DOE) Oak Ridge National Laboratory (ORNL) Buildings Technology - "Thermal Performance of the Exterior Envelopes of Whole Buildings Tenth International Conference". Archived from the original on 2008-01-25. Retrieved 2008-01-18.