Illinois State Archives & United States. Census Office. 7th census, 1850. (1850). [Seventh census of the United States, 1850.
Chicago-viite (17. p.)Illinois State Archives ja 1850 United States. Census Office. 7th census. [Seventh Census of the United States, 1850. 1850.
MLA-viite (8. p.)Illinois State Archives ja 1850 United States. Census Office. 7th census. [Seventh Census of the United States, 1850. 1850.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.