"About Green Roofs." 2005. Green Roofs for Healthy Cities. <http://www.greenroofs.org/index.php?option=com_content&task=view&id=26&Itemid=40#air>.
"Average Days of Precipitation, .01 Inches or More." Department of Meteorology. <http://www.met.utah.edu/jhorel/html/wx/climate/daysrain.html>.
"Intensive and Lawn Assemblies." 2008. American Hydrotech, Inc.. <http://www.hydrotechusa.com/intensive-lawn.html>.
"Monthly Climatic Data for Washington, D.C.." The Weather Channel. <http://www.weather.com>.
Pon, Brian. "High Temperatures." 27 April 2000. Heat Island Group. <http://eetd.lbl.gov/HeatIsland/HighTemps/>.
"Sustainable Design." 2000. American Hydrotech, Inc.. <http://www.hydrotechusa.com/sustainable-design.htm>.
Reference Guides
AISC Steel Construction Manual, Thirteenth Edition
ASHRAE Handbook of Fundamentals
R.S. Means Construction Cost Data 2008
Industry Members - Survey Feedback
Sean Cahill, Louis Dreyfus Property Group
Burgin Dossett, Crosland
Bill Forrey, Wohlsen Construction (formerly employed at Horst Development)
Meera Friemel, Greenebaum-Rose
Mark Konchar, Balfour Beatty Construction (formerly employed with a private developer)
Roberta Liss, CB Richard Ellis
David Miller, Boston Properties