Hi Swami,
What are you looking for in particular? There are several books available in market, for purchase and some free online documentation, targeted for various purposes. Since you posted this in certification forum, I assume that you are looking one for certification purpose.
As you might have seen in other threads, below are the resources people followed and following for completing the certification successfully.
1) Java webservices up and running.
2) RMH
3) Ivan notes (available in this forum)
4) Mikilai Zaikin notes.
5) above all, the threads in this forum.
Do not miss, reading
this.
All the best.