| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Enterprise Security: The Manager's Defense Guide | 978-0-201-71972-7 (0-201-71972-X) | 2002 |
| IT Manager's Guide to Virtual Private Networks | 978-0-07-135202-4 (0-07-135202-3) | 1999 |
| Managing Virtual Private Networks | 978-0-07-212851-2 (0-07-212851-8) | 2000 |
D.C. · D. Clark · D. Leon · David C. · David Clark · David L. · David L. Clark · David Leon · L. C. · L. Clark · Leon C.