1. Voice Problems of Children;Wilson,1987
2. Dejonckere, P.H., van Wijngaarden, H., Voice quality in children and environmental factors, Proceedings of the 5th International Congress of Pediatric Oto-Rhino-Laryngology, Ghent, 1990, p.44.
3. Clinical Examination of Voice;Hirano,1981
4. Differentiated perceptual evaluation of pathological voice quality: reliability and correlations with acoustic measurements;Dejonckere;Rev. Laryngol. Otol. Rhinol.,1996
5. Voice change in the pediatric patient;Cohen;Ann. Otol. (St Louis),1983