Saving Windows, Saving Money: Evaluating the Energy Performance of Window Retrofit Vs. Replacement
National Trust for Historic Preservation, 2012
https://forum.savingplaces.org/viewdocument/saving-windows-saving-money-evalu
PROFESSIONAL PAPER: ENERGY EFFICIENT WINDOW RETROFITS IN HISTORIC FACILITIES
Kent Hendricks, Department of Construction Management, Kansas Historical Society, 2006
https://www.kshs.org/preserve/pdfs/construction%20_management_energy_paper.pdf