T.D. Barnes, “The Editions of Eusebius’ Ecclesiastical History,” Greek, Roman, and Byzantine Studies, 21 (1980), pp. 191–201; Barnes, “The Composition of Eusebius’ Onomasticon,” Journal of Theological Studies 26 (1975), pp. 412–415, Barnes, The New Empire of Diocletian and Constantine (Cambridge, Mass: Harvard U. Press, 1982), pp. 213–214 and Constantine and Eusebius (Cambridge, Mass: Harvard U. Press, 1981), pp. 106–111.