Welcome to the Web site for the computer science textbooks of William Stallings. He is an 11-time winner of the Texty Award for the Best Computer Science and Engineering Textbook of the year, awarded by the Text and Academic Authors Association (TAA). All of the textbooks come with extensive support for students and instructors, including for instructors: projects manual for a wide variety of projects, PPT slides, solutions manual, and online mailing list; and for students: a student support page with useful links and documents, and supplemental online material including, for some books, supplemental online appendices and chapters. The books include:
Computer Organization and Architecture, Ninth Edition - just published
Computer Security, Second Edition 
Operating Systems, Seventh Edition
Data and Computer Communications, Ninth Edition
Cryptography and Network Security, Fifth Edition
Network Security Essentials, Fourth Edition
Business Data Communications, Sixth Edition - new edition due out in September 2012 - details
Wireless Communications and Networks, Second Edition
I created and maintain the Computer Science Student Resource Site. This site provides documents and links on a variety of subjects of general interest to computer science students (and professionals).
ERRATA Here are the latest errata sheets for my books. If you find any other errors, please contact me at 
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Here are some software directories to download: Shareware, Freeware programs online for various OSs, including windows, mac, Linux, etc.
Here is a collection of tutorials on all aspects of creating and maintaining a website, as well as many useful tools and downloads.
A copy of this Web page in Finnish.
Keep up with news about my books on Google+ Pages. 
