Collins, Roger. "Julian of Toledo and the Education of Kings in Late Seventh-Century Spain." Law, Culture and Regionalism in Early Medieval Spain. Variorum, 1992. pp. 1–22. ISBN0-86078-308-1. Revised version of "Julian of Toledo and the Royal Succession in Late Seventh Century Spain," Early Medieval Kingship, edd. P. H. Sawyer and I. N. Wood. Leeds: School of History, University of Leeds, 1977.
Edisi
J.N. Hillgarth, B. Bischoff, W. Levison (eds.), Iulianus Toletanus. Opera, I. Prognosticon futuri saeculi libri tres. Apologeticum de tribus capitulis. De comprobatione sextae aetatis. Historia Wambae regis. Epistula ad Modoenum. (= Corpus Christianorum. Series Latina, 115), Turnhout: Brepols Publishers, 1976
J.C. Martín-Iglesias, V. Yarza Urquiola (eds.), Iulianus Toletanus, Felix Toletanus, Iulianus Toletanus (Ps.). Opera, II. Elogium Ildefonsi, Vita Iuliani (auctore Felice Toletano), Antikeimena, Fragmenta, Ordo annorum mund (= Corpus Christianorum. Series Latina, 115A-B), Turnhout: Brepols Publishers, 2014
^Roger Collins regards this as being "quite unnecessarily Machiavellian"; see his Early Medieval Spain; Unity in Diversity, 400-1000, 2nd ed., New York: St. Martin's Press, 1995, pp. 77-78.