Citazione APA

Gregory, W. M., & Guitteau, W. B. (1922). History and geography of Ohio. Ginn.

Stile di citazione Chicago

Gregory, William M., e William Backus Guitteau. History and Geography of Ohio. Boston: Ginn, 1922.

Citazione MLA

Gregory, William M., e William Backus Guitteau. History and Geography of Ohio. Ginn, 1922.