Foundation and Empire
Isaac Asimov
Foundation (2)
21st Century C: C Tips From the New School
Ben Klemens
Building DMZs for Enterprise Networks
Robert J. Shimonski & Will Schmied & V Chang & Thomas W. Shinder
The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall
Peter N. M. Hansteen
The UNIX Programming Environment
Brian Wilson Kernighan & Rob. Pike