Vocal fold lesions, nodules, cysts, and polyps. University of Michigan. 1995-2015. Accessed August 2015. http://www.uofmhealth.org/conditions-treatments/vocal-fold-lesions-nodules-cysts-and-polyps.
Thyroid gland and the voice. (no date). EndocrineSurgeon.co.uk. Accessed August 29, 2014. http://www.endocrinesurgeon.co.uk/index.php/thyroid-gland-and-the-voice.
Disorders of the larynx that may cause a voice problem. The Voice and Swallowing Institute. New York Eye and Ear Infirmary of Mount Sinai. Accessed April 7, 2014. http://www.nyee.edu/cfv-larynx-disorders.html
American Academy of Otolaryngology – Head and Neck surgery. Fact Sheet: Nodules, Polyps, and Cysts. 2012. Accessed August 23, 2012. http://www.entnet.org/HealthInformation/nodPolypCysts.cfm.