The Population of Rome by Whitney J. Oates. Originally published in Classical Philology. Vol. 29, No. 2 (April 1934), pp. 101–116. Retrieved 22 April 2007.
fathom.lib.uchicago.edu
Family Values in Ancient Rome by Richard Saller. The University of Chicago Library Digital Collections: Fathom Archive. 2001. Visited 14 April 2007.