Cyril Toumanoff, How Many Kings Named Opsites?, in John Insley Coddington, Neil D. Thompson e Robert Charles Anderson (a cura di), A Tribute to John Insley Coddington on the Occasion of the Fortieth Anniversary of the American Society of Genealogists, Association for the Promotion of Scholarship in Genealogy, 1980. URL consultato il 22 settembre 2023.
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John Bagnell Bury, The Lazic War, in History of the Later Roman Empire, Vol. 2: From the Death of Theodosius I to the Death of Justinian, Courier Corporation, 2013, pp. 114-6. URL consultato il 22 settembre 2023.
Geoffrey Greatrex e Samuel N. C. Lieu, The Persian Campaign of 551, in The Roman Eastern Frontier and the Persian Wars AD 363-628, Routledge, 2005. URL consultato il 22 settembre 2023.