Crawford, Harriet E. W.; Crawford, Harriet Elizabeth Walston; Crawford, Professor Harriet (26 Apr 1991). Sumer and the Sumerians (بالإنجليزية). Cambridge University Press. ISBN:978-0-521-38850-4. Archived from the original on 2022-12-26.
Crawford, Harriet E. W.; Crawford, Harriet Elizabeth Walston; Crawford, Professor Harriet (26 Apr 1991). Sumer and the Sumerians (بالإنجليزية). Cambridge University Press. ISBN:978-0-521-38850-4. Archived from the original on 2022-12-26.