N. H. Azrin, R. G. Nunn and S. E. Frantz-Renshaw, Habit Reversal vs Negative Practice Treatment of Self-Destructive Oral Habits(Biting, Chewing or Licking of the Lips, Cheeks, Tongue or Plate), J. Behav. Ther. & Exp. Psychiat., Vol.13, No.1, pp.49-54, 1982