Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.