Didn't see these two mentioned yet: UNIX and Linux System Administration Handbook, 5th Edition, Chapter 2: Booting and System Management Daemons "Code" by Cha

Didn't see these two mentioned yet: UNIX and Linux System Administration Handbook, 5th Edition, Chapter 2: Booting and System Management Daemons "Code" by Charles Petzold, 2nd Edition, Chapter Twenty-Six: The Operating System The first one is totally fine to read stand-alone. "Code" makes more sense to read cover to cover, though the chapter on its own isn't totally useless.