Shadi Hamid (august 2003), „An Islamic Alternative? Equality, Redistributive Justice, and the Welfare State in the Caliphate of Umar”, Renaissance: Monthly Islamic Journal, 13 (8) (see onlineArhivat în , la Wayback Machine.)
Shadi Hamid (august 2003), „An Islamic Alternative? Equality, Redistributive Justice, and the Welfare State in the Caliphate of Umar”, Renaissance: Monthly Islamic Journal, 13 (8) (see onlineArhivat în , la Wayback Machine.)