1. Tongue thrusting;Andrews;J. South. California D.A.,1960
2. Ugly teeth;Ballard;Speech Path. & Therapy,1959
3. One approach to deviate swallowing;Barrett;AM. J. ORTHODONTICS,1961
4. Barrett, R. H.: Personal communication, May 24, 1965.
5. Observations of tongue-thrust swallow in preschool children;Bell;J. Speech & Hearing Disorders,1963