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2. Untitled Document. (n.d.). Retrieved June 1, 2015, from http://www.columbia.edu/~jcc2161/web-pages/HumanVoice.html
3. (n.d.). Retrieved June 1, 2015, from https://www.eduweb.vic.gov.au/edulibrary/public/ohs/voice_production.pdf
4. Human voice. (n.d.). Retrieved June 1, 2015, from http://en.wikipedia.org/wiki/Human_voice
5. Understanding Voice Production. (n.d.). Retrieved June 6, 2015, from http://voicefoundation.org/health-science/voice-disorders/anatomy-physiology-of-voice-production/understanding-voice-production/
6. How the Voice Works. (n.d.). Retrieved June 7, 2015, from http://www.entnet.org/content/how-voice-works