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"Music Science.What Makes Instruments Sound Different from One Another?" Grosse Pointe Music Academy. 3 Feb. 2012. Web. 2 Jan. 2015. <http://www.grossepointemusicacademy.com/what-makes-instruments-sound-different-from-one-another/>.
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"Music Science.What Makes Instruments Sound Different from One Another?" Grosse Pointe Music Academy. 3 Feb. 2012. Web. 2 Jan. 2015. <http://www.grossepointemusicacademy.com/what-makes-instruments-sound-different-from-one-another/>.
"Musical Instruments, Quality Characteristics." Musical Instruments, Quality Characteristics. Web. 2 Jan. 2015. <http://www.newton.dep.anl.gov/askasci/phy05/phy05164.htm>.
"The Sound of Music." Physics Classroom. Web. 2 Jan. 2015. <http://www.physicsclassroom.com/getattachment/actprep/act10.pdf>.