- Keith Sonnier
- Abaca-Code
- Galerie Denise René Hans Mayer, Düsseldorf, 1976
- folding card
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-
Ask
- Keith Sonnier
- Abaca-Code
- Galerie Denise René Hans Mayer, Düsseldorf, 1976
- folding card
-
-
Ask
- Prospect 71 Projection
- Konrad Fischer / Jürgen Harten / Hans Strelow
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Art-Press Verlag, 1971 ⁄ soft cover
- Ask
- Studio International: July/August 1970
- Seth Siegelaub, David Antin, Germano Celant, Michel Claura, Charles Harrison, Lucy R. Lippard, Hans Strelow
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Studio International, London, 1970 ⁄ softcover
- Ask
- SOTO 21.Mai – 30.Juni Kunsthalle Bern
- Denise René, Jesus Raphael SOTO, Paul Wember, Guy Brett
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Kunsthalle Bern, 1968 ⁄ folding sheets
- Ask
- Information
- Kynaston McShine, Lucy R. Lippard
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Museum of Modern Art New York, 1970 ⁄ softcover
- Ask
