References  
 
City of Chicago
http://www.ci.chi.il.us/Environment/rooftopgarden/temperature.pdf
McDonough + Partners
http://www.mcdonoughpartners.com/projects/p_chicago.html
ASLA Online
http://www.asla.org/meetings/awards/awds02/chicagocityhall.html
Conservation Design Forum, Inc.
CMHC/OAA Continuing Education for Architects
http://www.cmhc-schl.gc.ca/en/imquaf/himu/himu_002.cfm