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Henderson, L. B., (1979).  How to train singers.  West Nayack, New York: Parker Publishing Company.

    Husler, F. & Rodd-Marling, Y., (1965).  Singing: The physical nature of the vocal organ.  New York: October House Inc.

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    Koufman, J.A. (no date).  What are voice disorders and who gets them?  In Center for Voice Disorders of Wake Forest University  [On-line].  Available: http://bgsm.edu/voice/voice_disorders.html

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    Lawrence, V., (1978).  Part I:  The Scientific Papers.  Transcripts of the Seventh Symposium: Care of the professional voice.  The Julliard School, New York City: The Voice Foundation.

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    Miller, K.E., (1983).  Principles of singing.  Englewood Cliffs, N.J.: Prentice Hall.

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    Radomski, T.  (no date).  A singer's notes: Preventing vocal nodules.  In Center for Voice Disorders of Wake Forest University  [On-line].  Available: http://bgsm.edu/voice/singers_notes.html

    Titze, I.R.  (no date).  The mariachi voice.  In National Center for Voice and Speech [On-line].  Available: http://www.ncvs.org