1. UICC.TNM classsification of malignant tumors,1987
2. AJCC.Manual for staging of cancer,1988
3. SPSS Advanced statistics 6.1;Norussis,1994
4. Estudio retrospectivo del cáncer de región amigdalina;González;Acta Otorrinolaring Esp,1997
5. Carcinoma of the tonsil: prognostic factors;al Abdulwhed;J Otolaryngol,1997