- K. Schmidt, Cy Twombly, 2007, Thomas Ammann Fine Art, Zurich - Cy Twombly, 2004, Thomas Ammann Fine Art, Zurich

- K. Schmidt, Cy Twombly, 2007, Thomas Ammann Fine Art, Zurich
- Cy Twombly, 2004, Thomas Ammann Fine Art, Zurich
- Cy Twombly. Katalog IV, 1984, Galerie Karsten Greve, Cologne
Cy Twombly 1981, Galerie Karsten Greve, Cologne
- K. Varnedoe, Cy Twombly. A Retrospective, 1994, The Museum of Modern Art, NY