Using the old Sybex 460 book to study for 461?

So I have read half of the Cisco press 461 book and it is horrible. I have been trying to build my lab with it but it is missing so much information and commands are actualy missing from some of their configurations. Unfortunatly there are no other books out there except the Sybex 460 book. Would this have the same information in it or has everything changed since then?
Comments
Don't use the old books I believe the exams have four year gaps.
Also find some Voice bloggers, often they'll discuss interesting things that go into more detail than a book that may also help you.
Good luck!
I feel like the CCENT was so simple because i work with computers and networks all day every day but the Voice exam really does not branch off of anything i am already formiliar with. I just want to make sure that i am getting the overall understanding of the subject.