1. The Voice and Voice Therapy;Boone,2000
2. The s/z ratio as an indicator of laryngeal pathology;Eckel;J Speech Hear Disord,1981
3. Understanding Voice Problems: A Physiological Perspective for Diagnosis and Treatment;Colton,1996
4. Manual of Voice Treatment: Pediatrics Through Geriatrics;Andrews,1999
5. The Voice and Voice Therapy;Boone,1971