| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Leadership: 4 Competencies for Success | 978-0-13-921495-0 (0-13-921495-X) | 1998 |
| Leadership: What Every Leader Should Know About People | 978-0-13-526948-0 (0-13-526948-2) | 1986 |
A. P. · R. A. · R. A. P. · R. P. · Robert A. · Robert P. · Robert Portnoy