| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Developmental Tasks: Towards a Cultural Analysis of Human Development | 978-O-7923-29O5-3 (O-7923-29O5-8) | 1994 | Jan J.F. ter Laak · Andrei I. Podol'skij |
P.G. · P. H. · Peter G. · Peter H. · Peter Heymans