The Republic
Plato
TCP/IP Illustrated: Volume 2 The Implementation
W. Richard Stevens & Gary R. Wright
TCP/IP Ilustrated (2)
The Art of Computer Programming: Fundamental Algorithms
Donald E. Knuth
The Art of Computer Programming (1)
RT Essentials
Richard Foley
PMP® Exam Practice Test and Study Guide, Ninth Edition
J. Leroy Ward, Pmp, Pgmp & Ginger Levin