Adams, Robert M.
“Developmental Stages in Ancient Mesopotamia,” in Steward, Julian, et al, Irrigation Civilizations: A Comparative Study. 1955. Pan American Union.
Braidwood, Robert J.
The Near East and the Foundations for Civilization. 1952. University of Oregon.
Childe, V. Gordon
New Light on the Most Ancient East. 1952. Oriental Dept., Routledge and Kegan Paul.
Frankfort, Henri
The Birth of Civilization in the Near East. 1951. University of Indiana Press. (Also in Anchor edition, 1956.)
Pallis, Svend A.
The Antiquity of Iraq. 1956. Munksgaard.