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
1884 The Duke's version of Hamlet's soliloquy, combining elements of other speeches by Hamlet and pieces of Macbeth. The Adventures of Huckleberry Finn, ch.21.