D S · David A Schulz · David P. Schulz · David S.
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| CCNA Voice 640-461 Official Cert Guide and LiveLessons Bundle | 978-1-58720-427-2 (1-58720-427-4) | 2013 | Jeremy Cioara · Michael H. Valentine |
| Cisco Unity Connection | 978-1-58714-281-9 (1-58714-281-3) | 2011 | |