P W. · Peter W. Betts · W. B.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Supervisory Management | 978-0-582-41877-6 (0-582-41877-1) | 1999 |
| Supervisory Management | 978-0-273-60057-2 (0-273-60057-5) | 1993 |
| Supervisory studies | 978-0-273-03440-7 (0-273-03440-5) | 1991 |