Red Hat Linux Secrets – Paperback, by Barkakati Naba – Very Good
A nice touch in this textbook is the appendix with useful formulas and tables.
Red Hat Linux Secrets [W/o CDROM] by Barkakati, Nabajyoti
This textbook is the one I kept after the course ended for reference.
Red Hat Linux Secrets Paperback Nabajyoti Barkakati
This textbook has been updated to include the latest research in the field.