Good Introductory HSPICE Books
Although I do not have any book for recommendation I have found that having general SPICE knowledge plus documentation provided with HSPICE is sufficient to work with it (I use hspice on daily basis). 

The general spice knowledge you can get from many on line or paper tutorials. Any spice flavour will do (PSpice tutorials seems most common). It is important to stick to whatever is given in the text form and ignore anything on GUI. From the general "spice" knowledge tutorial you should get:  


what is netlist and what are the rules of creating it
what are the analysis and what they do (.ac .dc .op .tran)
what are devices and device models (sources, passive devices - RLC, active devices M - cmos transistors, D - diodes)


The details are to get from HSPICE documentation.

The common gotchas to look out:


First line have to be always comment and is always treated as a comment
In order to get graphical results you have to tell spice explicitly to save the results (".option post" -> all voltage nodes OR ".probe" plus ".option post probe" to save only certain node voltages/currents)
To view graphical results you need separate program (avanwaves or cosmoscope or waveviewer)


The most useful hspice only features (at least for me) are:  


.measure statements
.alters (used to run corner simulations)