1. International Union Against Cancer (UICC): TNM Classification of Malignant Tumors,1997
2. TNM classification according to the UICC and AJC;Snow,1993
3. Larynx and hypopharynx, in Computed Tomography and Magnetic Resonance Imaging of the Head and Neck;Mancuso,1985
4. Larynx;Million,1994