1) Thackray AC and Sobin LH: Histological typing of salivary gland tumors. International Histological Classification of Tumors. No. 7. Geneva, World Health Organization, 1972.
2) Healey W, Perzin KH and Smith L: Mucoepidermoid carcinoma of salivary gland origin; classification, clinical-pathologic correlation, and results of treatment. Cancer 26: 368-388, 1970.
3) Spiro RH: Salivary neoplasms; overview of a 35-year experience with 2,807 patients. Head Neck Surg 8: 177-184, 1986.