http://top40-charts.com/chart.php?cid=4

http://www.poparchives.com.au/gosetcharts/

http://www.take40.com/

http://www.coolgsmrings.com/au-top-chart-ringtones/

http://www.mp3-network.net/charts/top40.html

http://www.birdsinbackyards.net/feature/top-40-bird-songs.cfm

http://www.angelfire.com/empire/roundballs2/

http://www.coolgsmrings.com/dk-top-chart-ringtones/

http://www.abc3340.com/news/stories/0109/585758.html

http://www.milesago.com/Radio/top40.htm

http://www.lovetoknow.com/top10/australian.html

http://www.webshaker.co.uk/australian-chart-ringtones.php

http://www.mp3-network.net/

http://local.yahoo.com/results?stx=australian+top+40+singles+chart

http://en.wikipedia.org/wiki/Category:Australian_Top_40_radio_stations

http://www.poparchives.com.au/gosetcharts/covers.html

http://www.take40.com/action/countdownhome

http://top40.about.com/od/v/p/veronicas.htm

http://www.capec.info/documents/uni-rankings-oct-2008.pdf

http://fubar.com/blog/283614/989408