Hi Sean,
I used IAR Visual state for my product design.
If you have a Visual state tool, go through Get start document and user manual.
I think there is no need of any book, as these manual clearly provide all the details needed for developer
These documents provide you the full idea about how to model the system using IAR visual state and the Modelling tool basics.
Try to understand the examples provided along with the tool.
while you understand the tool, if you have any doubts put in forum.
I will try to answer.
Regards
Suresh