Siti internet-Lezione sull’apparato uditivo
http://www.nidcd.nih.gov/health/education/decibel/pages/decibel.aspx
http://www.nidcd.nih.gov/health/hearing/pages/sound-ruler.aspx
http://science.education.nih.gov/supplements/nih3/Hearing/activities/lesson1.htm
http://science.education.nih.gov/supplements/nih3/Hearing/activities/lesson3.htm
http://science.education.nih.gov/supplements/nih3/Hearing/activities/lesson4.htm