Olson. SOUND: Some Basic Concepts and Definitions. [Online] Available http://online.anu.edu.au/ITA/ACAT/drw/PPofM/sound/sound1.html, 1967

Definition of Intensity. [Online] Available http://www.neurophys.wisc.edu:80/~ychen/textbase/s1-p5.html, February 2, 1997.

Roederer. The Psychophysics of Loudness. [Online] Available http://online.anu.edu.au/ITA/ACAT/drw/PPofM/loud/Loud1.html, 1973.

[Online] Available http://online.anu.edu.au/ITA/ACAT/drw/PPofM/intensity/Intensity1.htmlDefinition of Intensity, February 2, 1997.

Roderer. The Psychophysics of Loudness. [Online] Available http://online.anu.edu.au/ITA/ACAT/drw/PPofM/loud/Loud3.html, 1973

[Online] Available http://online.anu.edu.au/ITA/ACAT/drw/PPofM/intensity/Intensity3.htmlComparison of Sound Intensity Level (SL), February 2, 1997.

Worrall, David. PHYSICS AND PSYCHOPHYSICS OF MUSIC (ACAT 1003). [Online] Available http://online.anu.edu.au/ITA/ACAT/drw/PPofM/INDEX.html, February 2, 1997.