Analysis of information sources in references of the Wikipedia article "இபின் கோர்தாத்பே" in Tamil language version.
Abu 'l-Ḳāsim ʿUbaid Allāh b. ʿAbd Allāh, an important geographer of Persian descent who was apparently born in the early years of the third century a. h. (c. 820).
Ebn Ḵordādbeh (fl. 9th cent., q.v.), one of the earliest Persian geographers, produced in 846 his major work Ketāb al-masālek wa'l mamālek, which is considered the foundation for the later Balḵī school of geography
