APA (7th ed.) Citation

Kramer, S. N. (1981). History Begins at Sumer<sup>3</sup>.

Chicago Style (17th ed.) Citation

Kramer, S. N. History Begins at Sumer<sup>3</sup>. 1981.

MLA (8th ed.) Citation

Kramer, S. N. History Begins at Sumer<sup>3</sup>. 1981.

Warning: These citations may not always be 100% accurate.