One is the "Inside the Apple IIe" Book by Gary B. Little. It is very similar to the older Apple II/II+ reference Manual, explaining all the hardware of the IIe, enhanced (with the 65C02) and unenhanced (with the 6502). WARNING: It is 430 pages long!
 
Link: http://www.hondosackett.com/yabb/Books/Inside_the_Apple_IIe.pdf
 
The second is a section (Chapter 4) take out of the "Apple IIe Technical Reference Guide." Strange, this is how I found it. As I seen the first few pages, it deals with the enhanced IIe (65C02) and how it manages bank switching with its 64K of RAM within the system, though it is similar as to how the Apple II/II+ did it with the Language card. It is 86 pages long.
 
Link: http://www.hondosackett.com/yabb/Books/AIIETECHREF2.pdf
 
Right-Click, Save, and then print out what you need from them.