Understanding Telephone Electronics, Fourth Edition
Steve Winder & Joseph Carr & Stephen Bigelow
PIC Microcontrollers: Know It All
Tim Wilmshurst & Dogan Ibrahim & Lucio Di Jasio & John Morton & Martin P. Bates & Jack Smith & David W Smith & Chuck Hellebuyck
Electronics: A First Course, Second Edition
Owen Bishop
Clean Code
Robert C. Martin
GSM Networks, Protocols, Terminology, Implementation
Gunnar Heine
Mobile Communications (1)