American Cancer Society, "Oral Cavity and Oropharyngeal Cancer: How Are Oral Cavity and Oropharyngeal Cancers Staged?" http://www.cancer.org/docroot/CRI/content/CRI_2_4_3X_How_is_oral_cavity_and_oropharyngeal_cancer_staged_60.asp?rnav=cri (accessed March 9, 2010)

American Cancer Society, "Oral Cavity and Oropharyngeal Cancer: What Are the Risk Factors for Oral Cavity and Oropharyngeal Cancers?" http://www.cancer.org/docroot/CRI/content/CRI_2_4_2X_What_are_the_risk_factors_for_oral_cavity_and_oropharyngeal_cancer_60.asp?rnav=cri (accessed March 9, 2010)

Merck Manuals Online Medical Library, "Cancerous Growths: Mouth Growths," http://www.merck.com/mmhe/sec08/ch113/ch113d.html (accessed March 9, 2010)

University of Virginia Health System, "Tongue Cancer: Condition," http://uvahealth.com/services/cancer-center/conditions-treatments/11498 (accessed March 9, 2010)

University of Virginia Health System, "Tongue Cancer: Diagnosis," http://uvahealth.com/services/cancer-center/conditions-treatments/11498 (accessed March 9, 2010)