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Henderson, Tom. “Physics Tutorial: The Human Ear.” The Physics Classroom, www.physicsclassroom.com/class/sound/Lesson-2/The-Human-Ear.
“The Physics of Sound.” The CIPIC Interface Laboratory Home Page, UC Davis College of Computer and Electrical Engineering, www.ece.ucdavis.edu/cipic/spatial-sound/tutorial/physics/#basics.
“Sound Waves.” PASCO Scientific, www.pasco.com/products/guides/sound-waves.