Analysis of information sources in references of the Wikipedia article "کهنهگرگانج" in Persian language version.
Blois, F.C. de. «Ras̲h̲īd al- Dīn Muḥammad b. Muḥammad b. ʿAbd al-Ḏj̲alīl al-ʿUmarī, known as Waṭwāṭ[پیوند مرده].» Encyclopaedia of Islam. Edited by: P. Bearman , Th. Bianquis , C.E. Bosworth , E. van Donzel and W.P. Heinrichs. Brill, 2008. Brill Online. UNIVERSITEITSBIBLIOTHEEK LEIDEN. ۱۶ April ۲۰۰۸
