STEIN Aurel (1940), Old Routes of Western Iran (https://library.hungaricana.hu/en/view/MTAKonyvtarKiadvanyai_BORB_02/?pg=116&layout=s )
WIKIPEDIA (pers.) : https://fa.wikipedia.org/wiki/%D8%AF%DA%98_%D8%B3%D9%81%DB%8C%D8%AF
LE STRANGE Guy (1905), the lands of the eastern caliphate - from the Moslem Conquest to the time of Timur, Cambridge Press (https://archive.org/details/landsofeasternca00lest)