Linux Network Administrator's Guide—Chapter 14. The Network Filesystem: www.linuxdoc.org/LDP/nag2/x-087-2-nfs.html
Linux NFS-HOWTO: www.linuxdoc.org/HOWTO/NFS-HOWTO
NFS Links, Questions and General Information: nfs.sourceforge.net
NFSv4 Project: www.citi.umich.edu/projects/nfsv4