Cita APA (7th ed.)
Kramer, S. N. (1959). History begins at Sumer. Doubleday Anchor Books.
Cita Chicago (17th ed.)
Kramer, Samuel Noah. History Begins at Sumer. Garden City, New York: Doubleday Anchor Books, 1959.
Cita MLA (9th ed.)
Kramer, Samuel Noah. History Begins at Sumer. Doubleday Anchor Books, 1959.
Atenció: Aquestes cites poden no estar 100% correctes.