Gregory, W. M., & Guitteau, W. B. (1922). History and geography of Ohio. Ginn.
Lua i Stíl Chicago (17ú heag.)Gregory, William M., agus William Backus Guitteau. History and Geography of Ohio. Boston: Ginn, 1922.
Lua MLA (8ú heag.)Gregory, William M., agus William Backus Guitteau. History and Geography of Ohio. Ginn, 1922.
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