Cita APA (7th ed.)
Barck, O. T. Since 1900: A History of The United States in Our Times (3a edición.). Macmillan.
Cita Chicago (17th ed.)
Barck, Oscar Theodore. Since 1900: A History of The United States in Our Times. 3a edición. Nueva York, EUA: Macmillan.
Cita MLA (9th ed.)
Barck, Oscar Theodore. Since 1900: A History of The United States in Our Times. 3a edición. Macmillan.
Atenció: Aquestes cites poden no estar 100% correctes.