APA (7th ed.) Citation

Bolton, H. E. (1939). Wider horizons of American history. D. Appleton-Century company, incorporated.

Chicago Style (17th ed.) Citation

Bolton, Herbert Eugene. Wider Horizons of American History. New York [etc.]: D. Appleton-Century company, incorporated, 1939.

MLA (8th ed.) Citation

Bolton, Herbert Eugene. Wider Horizons of American History. D. Appleton-Century company, incorporated, 1939.