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2. Thumb and Finger Sucking;Bliss;New Zealand D. J.,1945
3. Survey of Anterio-Posterior Abnormalities of the Jaws in Children Between the Ages of 2 and 512 Years of Age;Humphrey;Brit. D. J.,1950
4. Thumbsucking and the Dentition;Sillman;New York State D. J.,1951
5. Survey of Malocclusion and Some Aetiological Factors in 1,000 Sheffield School Children;Gardiner;D. Practitioner & D. Record,1956