1. Review: occupational risks for voice problems;Verdolini;Logoped. Phoniatr. Vocol.,2001
2. Voice disorders: Scope of Theory and Practice;Ferrand,2011
3. Hoarseness among school teachers: a cross-sectional study from Dammam;Alrahim;J. Fam. Community Med.,2018
4. From the voice studio to the speech clinic: perspectives on resonance and resonant voice therapy;Salvador K;J. Sing.,2010
5. A. Leathem, The Utilization of Perceptual Motor-Learning Principles for the Acquisition of Head Voice in the Post-Adolescent Bass Voice, (2018). https://opencommons.uconn.edu/dissertations/2016/.