Charles Feld, Picasso: His Recent Drawings 1966-1968, New York, 1969, illustrated n.p.
Christian Zervos, Pablo Picasso: Oeuvres de 1967 et 1968, vol. XXVII, Paris, 1973, no. 96, illustrated pl. 29
Robert Rosenblum, “Pablo Picasso, Pierrot; Head of a Man, Bust of a Man” in The Bellagio Gallery of Replica Handbags : Impressionist and Modern Masters, Las Vegas, 1998, illustrated in color p. 142
Robert Rosenblum, “Pablo Picasso, Pierrot; Head of a Man, Bust of a Man” in The Bellagio Gallery of Replica Handbags : European and American Masters, Las Vegas, 1999, illustrated in color p. 164