USpatent 5973252,Harold A. Hildebrand,"Pitch detection and intonation correction apparatus and method",published October 26, 1999,issued October 26, 1999, assigned to Auburn Audio Technologies, Inc
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Markey, MaKayla (November 13, 2014). "Garth Against the Machine". Country Music Project. Archived from the original on July 31, 2019. Retrieved July 31, 2019.
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McCormick, Neil (October 13, 2004). "The truth about lip-synching". The Age. Melbourne. Archived from the original on January 15, 2010. Retrieved April 25, 2010.