Wulfinghoff, D. R. (1999). Energy efficiency manual: For everyone who uses energy, pays for utilities, control energy usage, designs and builds, is interested in energy and environmental preservation. Wheaton, MD.: Energy Institute Press.
Παραπομπή Chicago StyleWulfinghoff, Donald R. Energy Efficiency Manual: For Everyone Who Uses Energy, Pays for Utilities, Control Energy Usage, Designs and Builds, Is Interested in Energy and Environmental Preservation. Wheaton, MD.: Energy Institute Press, 1999.
Παραπομπή MLAWulfinghoff, Donald R. Energy Efficiency Manual: For Everyone Who Uses Energy, Pays for Utilities, Control Energy Usage, Designs and Builds, Is Interested in Energy and Environmental Preservation. Wheaton, MD.: Energy Institute Press, 1999.