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Bunting, R.W. , AND Hill, T.J. , Oral Pathology, 2nd ed. rev. ( Philadelphia, Lea and Febiger: 1940 ), p. 159.

Macnevin, M.G. , AND Vaughan, H.S. , Mouth Infections and Their Relation to Systemic Disease ( New York, Purcell Memorial: 1930 ), p. 372.

Merritt, A.H. , Periodontal Diseases, 2nd ed. ( New York, MacMillan: 1939), p. 1.

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