| title | ISBN-13 | year of publication | |
|---|---|---|---|
| Goethe and Lessing;: The wellsprings of creation | 978-0-06-492509-9 | 1973 | |
| Goethe, Portrait of the Artist | 978-3-11-006928-0 | 1977 | |
| Heinrich von Kleist - Word into Flesh: A Poet's Quest for the Symbol | 978-3-11-007165-8 | 1977 | |
| Schiller's drama; talent and integrity | 978-0-06-492510-5 | 1974 |