Weiss, Michael and Hassan Hassan. ISIS: Inside the Army of Terror. New York: Regan Arts, 2015. p. 78
Bunzel, Cole. “From Paper State to Caliphate: The Ideology of the Islamic State.” Brookings Project on U.S. Relations with the Islamic World....
Caris, Charles C. and Samuel Reynolds. “ISIS Governance in Syria.” Middle East Security Report. 22. p 4, 2014. www.understandingwar.org/sites/default/files/ISIS_Governance.pdf
Hansen-Lewis, Jamie and Jacob N. Shapiro. “Understanding the Daesh Economy.” Perspectives on Terrorism. 9:4, 2015.
