Cita APA (7a ed.)

Bolton, H. E. (1939). Wider Horizons of American History. D. Appleton & Cy..

Cita Chicago Style (17a ed.)

Bolton, Herbert E. Wider Horizons of American History. New York: D. Appleton & Cy., 1939.

Cita MLA (9a ed.)

Bolton, Herbert E. Wider Horizons of American History. D. Appleton & Cy., 1939.