APA (7th ed.) Citation

Powell, M. A. (1978). Non-Slave Labor in Sumer.

Chicago Style (17th ed.) Citation

Powell, Marvin A. Non-Slave Labor in Sumer. Edinburgh, 1978.

MLA (8th ed.) Citation

Powell, Marvin A. Non-Slave Labor in Sumer. 1978.

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