Scheidel, Walter. "New Ways of Studying Incomes in the Roman Economy." Quantifying the Roman Economy: Methods and Problems. : Oxford University Press, 2009-06-25. Oxford Scholarship Online. 2009-09-01. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199562596.001.0001/acprof-9780199562596-chapter-17>.
Scheidel, W.(2009-06-25). New Ways of Studying Incomes in the Roman Economy. In Quantifying the Roman Economy: Methods and Problems. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199562596.001.0001/acprof-9780199562596-chapter-17.
Scheidel, Walter. "New Ways of Studying Incomes in the Roman Economy." In Quantifying the Roman Economy: Methods and Problems. : Oxford University Press, 2009-06-25. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199562596.001.0001/acprof-9780199562596-chapter-17.
Scheidel W. New Ways of Studying Incomes in the Roman Economy. In: Bowman A, Wilson A. Quantifying the Roman Economy: Methods and Problems. Oxford University Press; 2009. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199562596.001.0001/acprof-9780199562596-chapter-17. Accessed May 22, 2013.