I use the following book. It has some good concept overviews,
example netlists, etc. It also has a command reference in the
back. Note that I usually write my spice netlists by hand, if you
use a graphical spice, there might be better books. This book
does refer to the graphical spice, but there is little that is specific
to pspice.
SPICE: A Guide to Circuit Simulation and Analysis Using PSpice