Crawford, H. E. W. (2004). Sumer and the Sumerians (2nd ed.). Cambridge University Press.

Crawford, Harriet E. W. Sumer and the Sumerians. 2nd ed. Cambridge, UK ; New York: Cambridge University Press, 2004.

Crawford, Harriet E. W. Sumer and the Sumerians. 2nd ed. Cambridge University Press, 2004.