Libraria:

Bates M.L. - 1991 - Coins and Money in the Arabic papyri. In: Documents de l'Islam medieval. Il Cairo.
Bernardi G. - 2010 - Arabic Gold Coins. Corpus I., EUT & G. Bernardi (eds.), Trieste, 418.
Glassé C. - 2002 - The New Encyclopedia of Islam. Walnut Creek, CA, 463.
Islahi A. A. - 2004 - Contibutions of Muslim Scholars to Economic Thought and Analysis (11-905 A.H./ 632-1500 A.D. Jeddah.
Meri J. W. - 2005 - Medieval Islamic Civilization: An Encyclopedia. london, Routledge.

On line:

Afghan Chambre of Commerce - Harun al-Rashid.
Bates M. L. - Who Was Named on Abbasid Coins? What Did It Mean?
Beck S. - s.i.d. - Abbasids, Buyids, and Seljuqs 750-1095.
Evans N. - Introduction to Islamic Coins.
Islamiccoins - Abbasids Coins.
Mourad A.G., Rossi S. - 2010 - Storicità araba attraverso le monete cufiche. con collab. G. Bernardi
UNESCO - History of Civilizations of Central Asia.
Wijdan A. - 2004 - Islamic Coins during the Umayyad, Abbasid,Andalusian and Fatimid Dynasties.
Wikipedia - Harun al-Rashid.