| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Berichte zur Weiterbildung. Weiterbildung älterer Menschen in Industrieländern. | 978-92-2-707701-9 (92-2-707701-4) | 1990 |
| How to Train Older People | 978-92-2-108102-9 (92-2-108102-8) | 1991 |
| Training for Older People: A Handbook | 978-92-2-107294-2 (92-2-107294-0) | 1991 |
C.P. · P. C. · P.P. · Peter C. · Peter C. [Bearb.]: Plett · Peter P.