References
^ Frier, Bruce W.; Bagnall, Roger S. (1994). 9780521461238, Cambridge University Press. ISBN 9780521461238 (revised Jan 2014)^ Roger S. Bagnall, Bruce W. FrierThe Demography of Roman Egypt No. 23 by Bruce W. Frier and Roger S. Bagnall (1994, Hardcover) ISBN 9780521461238 (revised Feb 2015)
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