Books
Twenty Years of the Magazine of Fantasy & Science Fiction
1970
ISBN 9780425019238
The Traveler's Key to Ancient Egypt
1995
ISBN 9780835607247- No cover
Het astrologisch argument
1981
ISBN 9789063780739 
Body and Soul
1992
ISBN 9780140192803- No cover
La Serpiente celeste
2000
ISBN 9788425335082 - No cover
Esoterický Egypt
2004
ISBN 9788072811427