Cita APA (7th ed.)
Beard, C. A., & Beard, M. R. (1927). THE RISE OF AMERICAN CIVILIZATION.
Cita Chicago (17th ed.)
Beard, Charles A., i Mary R. Beard. THE RISE OF AMERICAN CIVILIZATION. 1927.
Cita MLA (9th ed.)
Beard, Charles A., i Mary R. Beard. THE RISE OF AMERICAN CIVILIZATION. 1927.
Atenció: Aquestes cites poden no estar 100% correctes.