Geographiae Claudii Ptolemaei . . . libri VIII, p. 87 (Textus apud Google Books).
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J. G. Th. Graesse, Orbis Latinus, 1972, vol. 3, p. 575. Vel Thospitis lacus (Orbis Latinus, ibidem; cf. G. R. Driver: The dispersion of the Kurds in ancient times. In.: Journal of the Royal Asiatic Society of Great Britain and Ireland 4, 1921, p. 564; vel Vastanus, Vasparaeus lacus, Ibanum mare (Orbis Latinus).