Cover art
| Title | Type | Year | |
|---|---|---|---|
|
|
The Aliens Among Us, Corgi Books / Transworld Publishers, 1970 | Edition | 1970 |
|
Brüder im Kosmos, Moewig, 1972 | Edition | 1972 |
|
Die Ärzte der Galaxis, Pabel, 1973 | Edition | 1973 |