Yeoman, P.S. Modern World Coins, 12th ed. Racine, Wisconsin: Western Publishing Col, 1979.-11, cf. Artuk, Ibrahim and Cevriye. Istanbul Arkeologi Muzeleri Teshirdeki Islami Sikkeler Katalogu. 2 vols. Istanbul: Milli Egitim Basimevi, 1971, 1974. 2071.
Yeoman, P.S. Modern World Coins, 12th ed. Racine, Wisconsin: Western Publishing Col, 1979.-10a, but only coins with years 2,3,4 and 10 are known of this type.