1. The Incidence and Significance of Fingernail Biting in Children;Wechsler;Psychoanalyt. Rev.,1931
2. Fingernail Biting: The Incipiency, Incidence, and Amelioration;Billig;Genet. Psychol. Monogr.,1941
3. The Psychology of Finger Sucking, Tongue Sucking, and Other Oral “Habits”;Pearson;Am. J. Orthodontia,1948
4. Onychophogy;Schwartzman;Arch. Pediat.,1939