Gaisford, G. (1975) Archer's Oral and Maxillofacial Oral Surgery, B. Saunders, Philadelphia, London. 5th ed., Vol. II, pp. 1795–1800.
Harrison, D. F. N. (1977) Tumours of the Nose and Sinuses, In Scott Brown's Diseases of Ear, Nose and Throat, Eds. Ballantyne, J. and Groves, J.Butterworth, London, 4th ed., Vol. 3, p. 374.
Homburger, F. (1971) Mechanical irritation, polycyclic hydrocarbons and snuff effects on facial skin, cheek pouch and oral mucosa in Syrian hamsters Archives of Pathology, 91: 411.
Kerr, D. and Ash, A. (1978) Oral Pathology, Lea and Febiger, Philadelphia, 4th ed., pp. 139–140.
Khanolkar, V. (1959) Oral Carcinoma in India. Acta Univ. Internat. Contra Cancrum, 6: 67.
Macbeth, R. (1965) Malignant Diseases of the Paranasal Sinuses. Journal of Laryngology and Otology, 74: 592.
Sanghvi, L., Rao, K. and Kandarker, S. (1955) Smoking and chewing of tobacco in relation to cancer of the upper alimentry tract. British Medical Journal, 1: 4.
Satyavati, M. and Khanolkar, S. (1968): Histological changes in the oral mucosa of the Wisar rat treated with commercial lime (Calcium Hydroxide). British Journal of Cancer, 22: 303.
Shaw, H. (1979) Tumours of the Larynx, In Scott-Brown's Diseases of Ear, Nose and Throat, Eds. Ballantyne, J. and Groves, J.Butterworths, London, 4th ed., (Vol. 4) p. 440.
Steel, P., and McGill, T. (1973) Lancet, 2: 416. (Quoted by Shaw, H. 1979).
Stirling, G., Khalil, A., Nada, G., Saad, A. and Raheem, M. (1979) Malignant Neoplasms in Saudi Arabia, Cancer, 45: 1543.
Stirling, G., Zahran, F., Jamjoom, A. and Eed, D. (1981) Cancer of the mouth in the Western region of Saudi Arabia. A Histopathological and Experimental Study. King Abdulaziz Medical Journal, 1: 10.
Sturton, S., Wen, H. and Sturton, O. (1979) Etiology of Cancer of the Nasopharynx, Cancer, 19: 1966–1969.
Ranger, D. (1979) Tumors of the Pharynx. In Scott Brown's Diseases of the Ear, Nose and Throat, Eds. Ballantyne, J. and Groves, J.Butterworths, London, 4th ed., Vol. 4, p. 184.
Waite, D. (1978) Text Book of Practical Oral Pathology, Lea and Febiger, Philadelphia, p. 341.