The Business and Economics of Linux and Open Source
Prentice Hall PTR, 20 September, 2002.

Open Source Web Development with LAMP: Using Linux, Apache, MySQL, Perl, and PHP
Addison Wesley Professional, 17 December, 2002.

MICO: An Open Source CORBA Implementation
Morgan Kaufmann, March, 2000.

Understanding Open Source Software Development
Addison Wesley Professional, 31 December, 2001.

Building Open Source Network Security Tools: Components and Techniques
John Wiley & Sons, 11 October, 2002.

Linux System Security: The Administrator's Guide to Open Source Security Tools, Second Edition
Prentice Hall PTR, 18 September, 2002.

FreeBSD: An Open-Source Operating System for Your Personal Computer, Second Edition (with CD-ROM)
The Bit Tree Press, 01 December, 2001.

PHP : Your visual blueprint for creating open source, server-side content
John Wiley & Sons, June, 2001.

The Cathedral and the Bazaar: Musings on Linux and Open Source by an Accidental Revolutionary
O'Reilly & Associates, 15 January, 2001.