- E-chocardiography Journal | An Electronic Journal of Cardiac Ultrasound | Alphabetical List. | Chronological List.www2.umdnj.edu/~shindler/echo.html
- www.kumc.edu/instruction/medicine/cont-ed/infotech/car-main.htm
- cpmcnet.columbia.edu/dept/cardiology/echo
- Normal and abnormal heart sounds are presented as .wav files.www.bioscience.org/atlases/heart/sound/sound.htm
