Dyfyniad APA
Crawford, H. E. W. (1991). Sumer and the Sumerians. Cambridge University Press.
Dyfyniad Arddull Chicago
Crawford, Harriet E. W. Sumer and the Sumerians. Cambridge ; New York: Cambridge University Press, 1991.
Dyfyniad MLA
Crawford, Harriet E. W. Sumer and the Sumerians. Cambridge University Press, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.