1. Sobin, LH, Wittekind, C, editors. International Union Against Cancer (UICC). TNM classification of malignant tumors. 5th ed. New York; Wiley-Liss; 1997.
2. Fleming ID, Cooper JS, Henson DE, et al., editors. American Joint Committee on Cancer (AJCC). AJCC Cancer staging manual, 5th ed. Philadelphia: Lippincott Raven; 1997.
3. World Health Organization. WHO international histological classification of tumors. Pindborg JJ, et al. Histologic typing of cancer and precursors of the oral mucosa. 2nd ed. Berlin: Springer-Verlag; 1992.
4. McClatchey KD, Zarbo RJ . The jaws and oral cavity. Chapter 18. In: Sternberg, SS editor. Diagnostic surgical pathology. 2nd ed. New York: Raven; 1994. p. 759–806.