F. H. Blackburne Daniell, Victor, Bishop of Capua, in W. Smith and H. Wace, eds., A Dictionary of Christian Biography (4 vols., London, 1877-1887), Vol. 1, p. 1126.
K. Aland & B. Aland, Der Text des Neuen Testaments, Deutsche Bibelgesellschaft, Stuttgart 1989, p. 197.
Bruce M. Metzger, Bart D. Ehrman, The Text of the New Testament: Its Transmission, Corruption and Restoration, Oxford University Press, New York — Oxford 2005, p. 108.