1. http://www.sospubs.co.uk/sos/may00/articles/mp3.htm
2. http://www.howstuffworks.com/mp3.htm/printable
3. http://www.sfu.ca/sca/Manuals/ZAAPf/e/equal_loud_cont.html
4. http://besar.dcs.gla.ac.uk/labs/audiolab/real_site/tutorials/mp3/mp3How.php
5. http://besar.dcs.gla.ac.uk/labs/audiolab/real_site/tutorials/intro/introHearing2.php
6. Compress This: Audio Compression (ELEC 301 project, 2001)
7. Carlson, Gordon E. Signals and Linear System Analysis. New York: John Wiley & Sons, Inc., 1998.