| title | ISBN-13 | year of publication |
|---|---|---|
| The Forging of the 'Ring': Richard Wagner's Composition Sketches for Der Ring Des Nibelungen | 978-0-521-21293-9 | 1976 |
| Wagner: A Biography: v. 1 & 2 in 1v. Tr. | 978-0-521-28254-3 | 1981 |
| Wagner: Volume 1, 1813-1864: A Biography | 978-0-521-21930-3 | 1978 |
| Wagner: Volume 2, 1864–1883: A Biography: 1864-83 v. 2 | 978-0-521-21932-7 | 1978 |