The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall
Peter N. M. Hansteen
Time Management for System Administrators
Thomas A. Limoncelli
Computational Number Theory and Modern Cryptography
Song Y. Yan
Ruby Under a Microscope: An Illustrated Guide to Ruby Internals
Pat Shaughnessy
Esta usted de broma, Sr. Feynman? / Surely You're Joking, Mr. ...