Southeastern Wisconsin Regional Planning Commission (July 2004). "The Population of Southeastern Wisconsin"(PDF). Technical Report Number 11 (4th Edition). Archived from the original(PDF) on October 31, 2008. Retrieved September 24, 2010.
Southeastern Wisconsin Regional Planning Commission (July 2004). "The Population of Southeastern Wisconsin"(PDF). Technical Report Number 11 (4th Edition). Archived from the original(PDF) on October 31, 2008. Retrieved September 24, 2010.