| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Purple Secret: Genes, 'Madness' and the Royal Houses of Europe | 978-0-552-14550-3 (0-552-14550-5) | 1999 | etc. · Martin Warren · David Hunt |
| Purple Secret: Genes, Madness and the Royal Houses of Europe | 978-0-593-04148-2 (0-593-04148-8) | 1998 | Martin Warren · David Hunt |
| The Kaiser and His Court: Wilhelm II and the Government of Germany | 978-0-521-56504-2 (0-521-56504-9) | 1996 | |
C. G. · C.R. · J C · J. G. · J R · John C. · John C. G. Röhl · John G. · John R. · John Rohl
Bantam Press · Cambridge University Press · Corgi