DNS and BIND, 3rd Edition, by Paul Albitz and
Cricket Liu (O'Reilly, 1998).
RFC849: Suggestions For Improved Host Table
Distribution, Mark Crispin, 1983.
RFC881: The Domain Names Plan and Schedule, J.
RFC882: Domain Names: Concepts And Facilities,
P. Mockapetris, 1983.
RFC1035: Domain Names: Implementation And
Specification, P. Mockapetris, 1987.