R. H. · Robert H. · Robert L. Hecker
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Nowoczesne formy zatrudnienia | 978-83-264-3188-3 (83-264-3188-5) | 2012 | Peter Holland · Patricia Leighton · Michel Syrett |
| Nowoczesne formy zatrudnienia | 978-83-264-0309-5 (83-264-0309-1) | 2010 | Peter Holland · Michel Syrett · Patricia Leighton |