Cita APA (7a ed.)
Kramer, S. N. (1959). History begins at Sumer. Doubleday Anchor Books.
Cita Chicago Style (17a ed.)
Kramer, Samuel Noah. History Begins at Sumer. Garden City, New York: Doubleday Anchor Books, 1959.
Cita MLA (9a ed.)
Kramer, Samuel Noah. History Begins at Sumer. Doubleday Anchor Books, 1959.
警告：这些引文格式不一定是100％准确.