Janssen, John (September 1999). "The History of Ventilation and Temperature Control"(PDF). ASHRAE Journal. American Society of Heating Refrigeration and Air Conditioning Engineers, Atlanta, GA. Archived(PDF) from the original on 14 July 2014. Retrieved 11 June 2014.
US EPA. Section 2: Factors Affecting Indoor Air Quality. "Archived copy"(PDF). Archived from the original(PDF) on 24 October 2008. Retrieved 30 April 2009.{{cite web}}: CS1 maint: archived copy as title (link)
Janssen, John (September 1999). "The History of Ventilation and Temperature Control"(PDF). ASHRAE Journal. American Society of Heating Refrigeration and Air Conditioning Engineers, Atlanta, GA. Archived(PDF) from the original on 14 July 2014. Retrieved 11 June 2014.
US EPA. Section 2: Factors Affecting Indoor Air Quality. "Archived copy"(PDF). Archived from the original(PDF) on 24 October 2008. Retrieved 30 April 2009.{{cite web}}: CS1 maint: archived copy as title (link)