Solaris Naming Setup and Configuration Guide--Describes how to set up, and configure NIS+ and DNS.
NIS+ Transition Guide--Describes how to make the transition from NIS to NIS+.
Additional books not part of the Solaris documentation set:
DNS and Bind, by Cricket Liu and Paul Albitz (O'Reilly, 1992).
Managing NFS and NIS by Hal Stern, (O'Reilly, 1993).