{{sfn | Scheidel | Morris | Saller | 2007 | p=}}

* {{cite book | last=Scheidel | first=Walter | last2=Morris | first2=Ian | last3=Saller | first3=Richard P. | title=The Cambridge Economic History of the Greco-Roman World | publisher=Cambridge University Press | publication-place=Cambridge | date=2007-11-29 | isbn=978-0-521-78053-7}}

<ref name="x238">{{cite book | last=Scheidel | first=Walter | last2=Morris | first2=Ian | last3=Saller | first3=Richard P. | title=The Cambridge Economic History of the Greco-Roman World | publisher=Cambridge University Press | publication-place=Cambridge | date=2007-11-29 | isbn=978-0-521-78053-7 | page=}}</ref>