Red Hat RHCE 8 (EX294) Cert Guide
Sander van Vugt
WildFly Configuration, Deployment, and Administration - Second ...
Christopher Ritchie
Seeking SRE: Conversations About Running Production Systems ...
David N. Blank-Edelman
Learning the Bash Shell: Unix Shell Programming
Cameron Newham & Bill Rosenblatt
Statistical Pattern Recognition
Andrew R. Webb & Keith D. Copsey