↑Kirsch, Johann Peter. "Pope St. Julius I." The Catholic Encyclopedia Vol. 8. New York: Robert Appleton Company, 1910. 28 September 2017. "Can you be ignorant," writes Julius, "that this is the custom, that we should be written to first, so that from here what is just may be defined" (Epistle of Julius to Antioch, c. xxii).
↑Martyrologium Romanum: ex Decreto Sacrosancti oecumenici Concilii Vaticani II instauratum auctoritate Ioannis Pauli P.P. II promulgatum, Romae 2001, ISBN 8820972107
Marejeo
Duff, Eamon. Saints and Sinners: A History of the Popes, Yale University Press, 2001, pp. 30–32. ISBN 0300091656
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