William Stallings books in order
9 books in the catalogue, about 117 hours of reading in all; the shortest takes 8 hours and the longest 15 hours.
9 standalone books in the catalogue.
Standalone books
Data and Computer Communications 14.9 h 
Computer Organization and Architecture 13.0 h 
Operating Systems 14.3 h 
Network Security Essentials 7.9 h 
Wireless Communications and Networking 10.9 h 
High-speed Networks and Internets 13.1 h 
Cryptography and Network Security 13.3 h 
Computer Security 15.0 h 
Operating Systems: Internals and Design Principles 14.7 h