Morris, Richard B. (1996). Encyclopedia of American History (Seventh izd.). Collins Reference. ISBN0062700553.
Peter C. Mancall, Gary B. Nash, Allan M. Winkler, Charlene Mires, John W. Jeffries, ur. (2009). Encyclopedia of American History. Facts on File. ISBN0816071365.
Stanley I. Kutler (2002). Dictionary of American History (Third izd.). Charles Scribners & Sons. ISBN0684805332.
Paul S. Boyer (2001). The Oxford Companion to United States History. Oxford University Press. ISBN0195082095.
OmahaWiki.org Omaha's free on-line encyclopedia that anyone can edit
Beerman, B.J. (2004) Where the hell is Omaha? AmericanMafia.Com - Article tells the history of Omaha's organized crime scene, including roles for various ethnic groups.
Citro, J. (n.d.) The Italians of Nebraska. - Includes photos of important Italian landmarks in Omaha.