1 "25 Things You Might Not Know about Chicago." Mental Floss. February 21, 2014. Accessed: February 2, 2016.
2 "America's Largest Police Departments." Law Enforcement EDU. March 27, 2014. Accessed: February 2, 2016
3 Babich, Tanja." Chicago Shootings, Murders up for August 2015." ABC News. September 1, 2015. Accessed: February 4, 2016.
4 Bernstein, Robert. "Ten U.S. Cities Now Have 1 Million People or More; California and Texas Each Have Three of These Places." United States Census Bureau. May 21, 2015. Accessed: February 8, 2015.
5 "Chicago Fun Facts."Choose Chicago. Accessed: February 1, 2016.
6 "Chicago." History. 2016. Accessed February 1, 2016.
7 "Chicago History Timeline." Chicago Public Library. 2016. Accessed: February 2, 2016.
8 "Chicago Transit Authority Fast Facts." CNN. Updated July 5, 2015. Accessed February 2, 2016.
9 "Facts and Statistics." City of Chicago. 2016. Accessed: February 1, 2016.
10 "Famous People Born in Chicago." Biography. Accessed: February 2, 2016.
11 Furse, Ray. City in Time, Chicago. New York, NY: Sterling Publishing Co., 2007.
12 Gustaitis, Joseph. Chicago's Greatest Year, 1893. Carbondale, IL: Southern Illinois University Press, 2013.
13 "Illinois Facts and Trivia." 50 States. 2016. Accessed: February 2, 2016.
14 Koppes, Steve. "How the First Chain Reaction Changed Science." The University of Chicago. 2016. Accessed: February 8, 2016.
15 Krist, Gary. City of Scoundrels. New York, NY: Crown Publishers, 2012.
16 Madhani, Aamer. "Murders, Shootings on the Rise in Chicago." USA Today. Updated April 2, 2015. Accessed: February 4, 2016.
17 Solomon, Brian, Chris Guss, and John Gruber. Chicago: America's Railroad Capital. Minneapolis, MN: Voyageur Press, 2014.
18 "Timeline Chicago." Timelines of History. Accessed: February 8, 2016.
19 "Timeline." Encyclopedia of Chicago. 2005. Accessed: February 8, 2016.
20 Wilson, Caitlin. "100 Historical Chicago Fun Facts." Reboot Illinois. August 10, 2015. Accessed: February 1, 2016.
21 ———.Chicago Has the Most Rats of Any City, Says Pest Control Company." Reboot Illinois. October 14, 2014. Accessed: February 1, 2016.