John Addington Symonds, Michelangelo Buonarroti (2002). “The Life of Michelangelo Buonarroti: Based on Studies in the Archives of the Buonarroti Family at Florence”, p.110, University of Pennsylvania Press
Henry George Bohn, John Ray (1860). “A Hand-book of Proverbs: Comprising an Entire Republication of Ray's Collection of English Proverbs, with His Additions from Foreign Languages : and an Alphabetical Index, in which are Introduced Large Additions, as Well of Proverbs as of Sayings, Sentences, Maxims, and Phrases”, p.383