Source Information Illinois, Historical and Statistical [database on-line]. Provo, UT: Operations Inc, 2005.
Original data: Moses, John,. Illinois, historical and statistical : comprising the essential facts of its planting and growth as a province, county, territory, and state : derived from the most authentic sources, including original documents and papers, together with carefully prepared statistical tables relating to population, financial administration, industrial progress, internal growth, political and military events. Chicago: Fergus Print. Co., 1889-1892, c1887-1892.