The GNU Make Book
John Graham-Cumming
Defensive Security Handbook: Best Practices for Securing Infrastructure
Lee Brotherston & Amanda Berlin
Certified Kubernetes Administrator (CKA) Study Guide
Benjamin Muschko
The DevOps 2.5 Toolkit
Viktor Farcic
PostgreSQL 9.0 High Performance
Gregory Smith
Moving to Office 365: Planning and Migration Guide
Matthew Katzer