[4] H. B. van Hoesen [and] F. K. Walter, Bibliography, Practical, Enumerative, Historical (New York: Charles Scribner's Sons, 1928).
[5] Alfred W. Pollard, An Essay on Colophons, with Specimens and Translations; with an Introduction by Richard Garnett (Chicago: The Caxton Club, 1905).
[6] Cicero, Epistolae ad Familiares, Second edition (Venice, 1469).
[7] Diui Athanasii, contra Arium, etc. (Paris, 1500).
[8] Decretals of Gregory IX (Rome, 1474).
[9] We may note that the French technical term for the modern colophon, "achevé d'imprimer," emphasizes this importance of the printer.