Referências
[1] http://www.apple.com/itunes/
[2] http://www.iis.fraunhofer.de/EN/bf/amm/mp3history/mp3history01.jsp
[4] http://www.hydrogenaudio.org/forums/index.php
[5] http://www.listening-tests.info/
[6] Rassol Raissi. The Theory Behind MP3, December 2002
[7] Karlheinz Brandenburg. MP3 and AAC Explained