I am enjoying a 2017 book on Al Davis and the Raiders by two front office officials, Bruce Kebric and Jon Kingdon, (w/ Steve Corkran) who had worked there for many years (mostly in scouting). It's entitled "Behind the Raiders Shield Untold Stories from Longtime Davis Confidants" and has a lot of insight and some good tales about the organization.
If you are a Raider / Davis fan you might enjoy it.