J. S. · John L. Schum · John S.
Butterworth-Heinemann · McGraw-Hill
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Electronic Locking Devices | 978-0-409-90125-2 (0-409-90125-3) | 1988 |
| Locksmithing and Electronic Security Wiring Diagrams | 978-0-07-139305-8 (0-07-139305-6) | 2002 |