Leonardo da Vinci (Nachahmer): Grotesque caricature heads of five men and two women, Feder in Braun auf Papier, 172 x 120 mm. Inv. Nr. 1886,0609.40, British Museum, Department of Prints and Drawings, London
Francesco Melzi nach Leonardo da Vinci, Two Grotesque Heads, Feder in Braun auf Papier, 45 x 99 mm. Inv. Nr. 1980.63.1, National Gallery of Art, Washington/DC