1. Thumb and Finger Sucking in Relation to Feeding in Early Infancy;Roberts;Am. J. Dis. Child.,1944
2. Fingersucking and Accessory Movements in Early Infancy;Levy;Am. J. Psychiat.,1928
3. Thumb or Finger Sucking From the Psychiatric Angle;Levy;Angle Orthodont.,1937
4. Experiments on Sucking Reflex and Social Behavior of Dogs;Levy;Am. J. Orthopsychiat.,1934
5. Sucking in Infancy;Brazelton;Pediatrics,1956