Tolong jelaskan mengenai Sumber dari Yulianus dari Toledo

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. . 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.