Staff (April 24, 2012). "Contract Number 2012-0366". Michigan Department of Transportation. Archived from the original on January 5, 2013. Retrieved May 7, 2012.
"A Brief History". Central Michigan University—Clarke Historical Library. February 5, 2010. Archived from the original on February 3, 2013. Retrieved October 19, 2010.
"A Brief History". Central Michigan University—Clarke Historical Library. February 5, 2010. Archived from the original on February 3, 2013. Retrieved October 19, 2010.
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Staff (April 24, 2012). "Contract Number 2012-0366". Michigan Department of Transportation. Archived from the original on January 5, 2013. Retrieved May 7, 2012.