1. 1. Kuehn DP: Assessment of resonancy disorders In Lass JJ McReynolds LV Northern JL et al (eds): Speech Language and Hearmg V. Il ftiAolopes of Speech and Language. Philadelphia WB Saunders Co 1982.
2. 2. Skolnik ML: Videofluoroscopic examination of velopharyngeal portal during phonation in lateral and base projections: A new technique for studying the mechanics of closure. CIt/t Palate) 1970; 7:803-816.
3. 3. Benkson NW. Bemthal JE: Articulation assessment in Lass JJ McReynolds LV Northern JL et al (eds): Speech Language and Hearing V. Il Pathologies of Speech and Language. Philadelphia WB Saunders Co 1982.
4. 4. Report of panel on communication disorders: US Dept. of Health Education and Welfare NIH Publication #79-914. June 1979.
5. 5. McReynolds LV. Elbert MF: Articulation disorders of unknown etiology and their remediation in Lass JJ McReynolds LV Northern JL et al (eds): Speech Language and Hearing V. Il Pathologies o/Speechand Language Philadelphia WB Saunders Co 1982.