``Introduction to Digital Formats for Library of Congress Collections.'' http://www.digitalpreservation.gov/formats/intro/intro.shtml.
Bosi, Marina, and Richard E. Goldberg. Introduction to Digital Audio Coding and Standards. Boston: Kluwer Academic, 2003. ISBN 1402073577.
Thorough, but highly technical, information on digital audio coding algorithms and the MPEG family of standards. Treatment of psychoacoustic modeling is particularly good. Provides no coverage, however, for popular non-MPEG standards like WMA, Real, and Ogg Vorbis.