Books

Apple IIe Reference Manual 15 chapters 306 topics
Technical Reference for the Apple IIe personal computer. It contains detailed descriptions of all of the hardware and firmware that make up the Apple IIe and provides the technical information that peripheral-card designers and programmers need.
Senior PROM v3.0 Documentation 12 chapters 33 topics
The Senior PROM is a debugging and copy protection removal aid for the Apple //e. It consists of a circuit board with replacement firmware EPROM and a button that triggers an NMI (Non Maskable Interrupt), along with a disk containing utilities. Amongst other features, the Senior PROM can allow an running program to be written to a 'resurrection disk' which when booted resumes the program. This allows for creating backups of 'single load' games.
Understanding the Apple II 26 chapters 299 topics
Understanding the Apple II (by Jim Sather) is a incomparable source of information about how the Apple II works. It documents all motherboard circuits, describes the disk controller operation, explains RAM and ROM and includes 23 hardware and software Application Notes, including shift key mod, disk write protect mod, and EPROM mods

Magazines

Hardcore Computist 89 issues 5058 topics
Hardcore Computist was a magazine devoted to the Apple II. The primary topic was the removal of copy protection from commercial software.
Scans are courtesy of The Computist Project
YIPL/TAP 93 issues 100 topics
The Youth International Party Line (YIPL), later known as TAP for Technological American Party or Technological Assistance Program, was a phreaker magazine started by Yippie founder Abbie Hoffman of the 'Chicago 7' and 'Al Bell', a phreaker from Long Island.
ViCTA - Vintage Computing Technology Archive