1. Sobin LH, Wittekind CH.International Union Against Cancer (UICC). TNM Classification of Malignant Tumours. 5th ed. New York: Wiley, 1997.
2. Fleming ID, Cooper JS, Henson DE, et al. eds.Manual for Staging of Cancer. American Joint Committee on Cancer. 5th ed. Philadelphia: JB Lippincott, 1997.
3. Japanese Research Society for Gastric Cancer.Japanese Classification of Gastric Carcinoma. 1st English ed. Tokyo: Kanehara & Co., Ltd., 1995.
4. Japanese Gastric Cancer Association.Japanese Classification of Gastric Carcinoma. 2nd English ed.Gastric Cancer 1998;1:10–14.
5. Hermanek P, Sobin LH, eds.UICC TNM Classification of the Malignant Tumours. 4th ed. Berlin: Springer, 1987.