1. Understanding Voice Problems: A Physiological Perspective for Diagnosis and Treatment;Colton,1996
2. Normative data on the speaking fundamental frequency characteristics of young adult males;Hollien;J Phonet,1973
3. The Physics of Speech (Cambridge textbooks in linguistics);Fry,2001
4. Clinical Measurement of Speech and Voice;Baken,2000
5. The Frequency Range of the Voice Fundamental in the Speech of Male and Female Adults;Traunmüller,1993