^Lurker, Manfred (1987). The Routledge Dictionary of Gods and Goddesses, Devils and Demons. Routledge. p. 30. ISBN 0-415-34018-7.
^Jan Retso, The Arabs in Antiquity, Routledge 2003. See pp. 518-9 for Isaac of Antioch's letter. See pg. 604 for discussion on the identification of Baltis.
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