World Health Organisation International Histological Classification of Tumours. Histological Typing of Cancer and Precancer of the Oral Mucosa
Pindborg JJ, Reichart PA, Smith CJ, van der Waal I, (1997). World Health Organisation International Histological Classification of Tumours. Histological Typing of Cancer and Precancer of the Oral Mucosa. 2 ed. Berlin: Springer.