CISM Certificate

Dear All :
I am old in the Security Field - have about 8 years of experience - and I
never got a formal certificate till last year !
I started and I took the :
- CCSP from Cisco
- MCSE with Security from Microsoft
- Security+ from CompTIA
- I went through the CISSP Exam 2 days ago and I am waiting the results
( I hope I pass because the exam was out of what I did study !!! )

and I intend to go after the CISM Exam from ISACA .

What is your suggestions ? and how can I prepare myself for this exam ?
What is the best book I should go after ?