E.H. · Earl Of Harwood · The Earl of Harewood
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Definitive Kobbe's Opera Book | 978-0-399-13180-6 (0-399-13180-9) | 1987 | Harewood |
| The New Kobbe's Opera Book | 978-0-09-181410-6 (0-09-181410-3) | 1997 | Anthony Peattie |
| The New Pocket Kobbé's Opera Book | 978-0-09-187093-5 (0-09-187093-3) | 1999 | |