Feld, C. (1969). Picasso: His recent drawings, 1966-1968. Harry N. Abrams.
Lua i Stíl Chicago (17ú heag.)Feld, Charles. Picasso: His Recent Drawings, 1966-1968. Nueva York: Harry N. Abrams, 1969.
Lua MLA (9ú heag.)Feld, Charles. Picasso: His Recent Drawings, 1966-1968. Harry N. Abrams, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.