http://en.wikipedia.org/wiki/Sampling_(signal_processing)

http://www.jhu.edu/signals/sampling/index.html

http://www.ee.ic.ac.uk/pcheung/teaching/ee2_signals/lecture%2013%20-%20sampling%20&%20discrete%20signals.pdf

http://www2.egr.uh.edu/~glover/applets/Sampling/Sampling.html

http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/iandm/part7/page3.html

http://www.google.com/url?sa=t&rct=j&q=signal+sampling+ppt&source=web&cd=1&cad=rja&ved=0CDMQFjAA&url=http%3A%2F%2Fsignal.ece.utexas.edu%2F~arslan%2Fcourses%2Fdsp%2Flecture2.ppt&ei=fgbnUNrFL8Wn4gTshIGIAg&usg=AFQjCNFXBdaelGhkHZnm6aR49lFxNFWO4Q&bvm=bv.1355534169,d.bGE

http://www.google.com/url?sa=t&rct=j&q=signal+sampling+ppt&source=web&cd=2&cad=rja&ved=0CDkQFjAB&url=http%3A%2F%2Fwww.ics.uci.edu%2F~magda%2FCourses%2Fnetsys270%2Fch4_2_v1.ppt&ei=fgbnUNrFL8Wn4gTshIGIAg&usg=AFQjCNEmUlDvJ5mBIJKU3I28V3dcAoYyqw&bvm=bv.1355534169,d.bGE

http://www.google.com/url?sa=t&rct=j&q=signal+sampling+ppt&source=web&cd=5&cad=rja&ved=0CEoQFjAE&url=http%3A%2F%2Fcontrol.sdu.edu.cn%2Fbdsp%2Fkejian%2FChapter4%2520Sampling%2520of%2520Continuous-Time%2520Signals.ppt&ei=fgbnUNrFL8Wn4gTshIGIAg&usg=AFQjCNF_QuQMboqjLDihp6Fs6oLf-MlM3A&bvm=bv.1355534169,d.bGE

http://www.google.com/url?sa=t&rct=j&q=signal+sampling+ppt&source=web&cd=6&cad=rja&ved=0CE8QFjAF&url=http%3A%2F%2Fetidweb.tamu.edu%2Fftp%2F489-501%2FChapter%25206%2520-%2520Sampling%2520Theory.ppt&ei=fgbnUNrFL8Wn4gTshIGIAg&usg=AFQjCNHsmEHuBPCM9zWaWsc6jTdpRMSTjQ&bvm=bv.1355534169,d.bGE