APA (7th ed.) Citation

Davis, O. j. (1971). America in the twentieth century ([Bd.] 6.). American Book.

Chicago Style (17th ed.) Citation

Davis, O.L. junior. America in the Twentieth Century. [Bd.] 6. New York [u.a.]: American Book, 1971.

MLA (9th ed.) Citation

Davis, O.L. junior. America in the Twentieth Century. [Bd.] 6. American Book, 1971.