Cita APA (7th ed.)
Bark, W. C. Origins of the Medieval World. Anchor Books : Doubleday.
Cita Chicago (17th ed.)
Bark, William Carroll. Origins of the Medieval World. Nueva York, EUA: Anchor Books : Doubleday.
Cita MLA (9th ed.)
Bark, William Carroll. Origins of the Medieval World. Anchor Books : Doubleday.
Atenció: Aquestes cites poden no estar 100% correctes.