| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1996 | 978-0-9529506-0-8 | Steven Freeman ยท Alan Freeman | A Crack in the Cosmic Egg: Encyclopedia of Krautrock, Kosmische Musik and Other Progressive, Experimental and Electronic Musics from Germany |
| 978-0-9529506-1-5 | The Crack In The Cosmic Egg | ||