- Ulrich Klatte
The Vertigo Swirl Label
worldwide discography and price guide
CPG Books - Hans Pokorra
Rare Record Cover Book - Hans Pokorra
1001 / 2001 / 3001 / 4001 / 5001
Record Collector Dreams
Eigenverlag - Phil Ochs
1000 Rock Covers
Taschen Verlag - Rock & Pop Preiskatalog 2008
NikMa Musikbuchverlag
