Contributing Writer 7
 | Testcard #14 Discover America | Paperback |
 | Spex # 297 (No. 04/2006) | Magazine |
 | Spex # 299 (No. 06/2006) | Magazine |
 | Testcard #17 Sex | Paperback |
 | Spex # 318 (No. 01/02 2009) | Magazine |
 | Testcard #21 Überleben | Paperback |
 | Testcard #23 Transzendenz - Ausweg, Fluchtweg, Holzweg? | Paperback |
Interview by/Interviewer 2
 | Spex # 274 (No. 03/2004) | Magazine |
 | Spex # 298 (No. 05/2006) | Magazine |
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