Redhat
- Red Hat Enterprise Linux Documentation http://www.redhat.com/docs/manuals/enterprise/
- Training and certification https://www.redhat.com/training/
- How-do-I-use-up2date-locally-disconnected-from-the-network?
- How-can-I-update-my-system-to-a-particular-update-level-using-ISO-images-with-Red-Hat-Enterprise-Linux-5
- Mono-install-on-RHEL