Nyrop, Richard F. (2008). Area Handbook for the Persian Gulf States. Richard F. Nyrop. s. 11. ISBN9781434462107. «From about 4000 to 2000 B.C. the civilization of Dilmun dominated 250 miles of the eastern coast of Arabia from present-day Kuwait to Bahrain and extended sixty miles into the interior to the oasis of Hufuf (see fig. 2).»
«Hellenism in the East»(PDF). Amelie Kuhrt, Susan Sherwin-White. 1987. «To the south of Characene, on Failaka, the north wall of the fort was pushed forward, before occupation ceased around 100 BC.»
