APA (7th ed.) Citation

Riegel, R. E. (1951). United States of America: A history. Scribner.

Chicago Style (17th ed.) Citation

Riegel, Robert Edgar. United States of America: A History. New York: Scribner, 1951.

MLA (8th ed.) Citation

Riegel, Robert Edgar. United States of America: A History. Scribner, 1951.