Dear all,
I have been working as server and network engineer for 4 years, and i would like to take this exam. ( my new year resolution )

would be great if someone can tell me which is the correct study material that i should go for, i would prefer the PDF version as im a book person.
Currently im studying on CISSP sixth edition by Shon Harris. Not sure if this is the correct one too?
Many thanks to all the advise in advance !
Cheers