Books to learn FreeBSD structure

I'm thinking on buy a book to learn intern structure of freebsd, in other old thread i did see that recommend some books like:

http://www.informit.com/store/design-and-implementation-of-the-freebsd-operating-9780201702453

And:

https://www.amazon.fr/Designing-BSD-Rootkits-Introduction-Hacking/dp/1593271425
https://www.amazon.fr/Designing-BSD-Rootkits-Introduction-Hacking/dp/1593271425
My questions are:

Are the information in these books still more or less current to learn?
Any book in Spanish?

Thanks.
 
Also try Kong's newer book on FreeBSD device drivers. I have been reading this and it seems great! Kong makes a lot of effort to explain things, and whatever he omits is fun to figure out on your own :).
 
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