DePue, Mark (August 21, 2007). "ISG-A-L-2007-015 Interview # 1 of 3"(PDF). Interview with Dan Walker via rebootillinois.com. Archived from the original(PDF) on March 4, 2016. Retrieved May 1, 2015.
DePue, Mark (August 21, 2007). "ISG-A-L-2007-015 Interview # 1 of 3"(PDF). Interview with Dan Walker via rebootillinois.com. Archived from the original(PDF) on March 4, 2016. Retrieved May 1, 2015.