1. T. Barka, and P. Anderson, 1963 . Histochemistry . Harper and Row. New York, p.312 -318 .
2. HISTOCHEMICAL AND ELECTRONMICROSCOPICAL ASPECTS OF HUMAN BUCCAL MUCOSA
3. S.Y. Chen, 1970 . Comparison of the Fine Structure of the Mucosa of Cheek and Hard Palate in the Rabbit . M.S. Thesis , University of Illinois, Chicago.