Pierce, Allan D. “The Wave Theory of Sound”. Acoustical Society of America. May 30 2010
“Sound Wave Interference”. NDT Resource Center. May 30 2010
Nave, C.R. “Refraction of Sound”. Georgia State University. May 31 2010
“Sound Reflection/Refraction”. NDT Resource Center. June 1 2010
“Behavior of Sound Waves”. The Physics Classroom. May 30 2010
“Reflection of Sound”. NDT Resource Center. June 1 2010
