Good book about the freeBSD architecure

Hi Guys,
I need some help in getting a good book that describes the internals of the freeBSD OS, like the architecure, the process and memory management, etc..
I have some book which is named : the design and implementation of the freeBSD operating system, but I feel it's somewhat advanced, or hard to follow.
If someone knows another book, I would be thankfull for him if he told me about it.
Regards,
Marwan

Amazon.com: The Design and Implementation of the FreeBSD Operating System: Marshall Kirk McKusick, George V. Neville-Neil: Books

Possibly unrelated to what you are looking for, but Absolute FreeBSD - 2nd Ed. [1] is a good read. The book deals with basic management / implementation of FreeBSD (and focuses of 7.X).

If this is not what you're looking for, perhaps (in case I am guessing correctly on my second try) have a look at the FreeBSD Developers Handbook [2].

HTH.

[1] No Starch Press: Absolute FreeBSD, 2nd Edition
[2] FreeBSD Developers' Handbook