Cita APA (7th ed.)
Barnes, H. E., & David, H. (1935). The history of western civilization. Harcourt.
Cita Chicago (17th ed.)
Barnes, Harry Elmer, i Henry David. The History of Western Civilization. New York: Harcourt, 1935.
Cita MLA (9th ed.)
Barnes, Harry Elmer, i Henry David. The History of Western Civilization. Harcourt, 1935.
Atenció: Aquestes cites poden no estar 100% correctes.