References
- Darley, F., Aronson, A. E., & Brown, J. (1975). Motor speech disorders (pp. 235–243). Philadelphia: W. B. Saunders
- Wertz, R. T. (1985) Neuropathologies of speech and language: An introduction to patient management. In D. F. Johns (Ed.), Clinical management of neurogenic communicative disorders (pp. 80–81). Boston: Little, Brown.