- Eustathius on Homer, p. 596.
- Lycophron, 448, with Tzetzes' note.
- Smith, William. (1870). Dictionary of Greek and Roman Biography and Mythology. London: Taylor, Walton, and Maberly.
- Stephanus of Byzantium, s.v. Ὕλη.
This article incorporates text from Dictionary of Greek and Roman Biography and Mythology (1870) by William Smith, which is in the public domain.