The title of High Admiral was introduced in the Imperial Sourcebook; the same publication shows a rank plaque for a Priority Sector High Commander which corresponds to the badge worn by Grand Moff Wilhuff Tarkin in A New Hope.
- Imperial Sourcebook
- Pirates & Privateers
- Cynabar's Fantastic Technology: Droids
- The Official Star Wars Fact File125
- The Complete Star Wars Encyclopedia
- The Essential Guide to Warfare