1. Kreiman J, Gerratt B. Perceptual assessment of voice quality: Past, present, and future. En: Ma EPM & Yiu EML. Handbook of voice assessments. San Diego: Plural Publishing; 2011 p. 291 - 304.
2. American National Standards Institute. American National Standard bioacoustical terminology (ANSI S3.20-2015). New York, NY: Author. Disponible en: https://asastandards.org/Terms/timbre/ Página web de ASA - Acoustical Society of America [acceso 24 Jun 2016; actualizada 24 Jun 2016]
3. Ferrer CA, Haderlein T, Maryn Y, de Bodt MS, Nöth E. Collinearity and Sample Coverage Issues in the Objective Measurement of Vocal Quality: The Case of Roughness and Breathiness . J Speech Lang Hear Res. 2018 Jan 22; 61(1):1-24.
4. Real Academia Española. Diccionario de la lengua española. Edición del tricentenario. Disponible en: http://dle.rae.es/?id=BRNxtDx Página web de la Real Academia Española [acceso 16 Oct 2016; actualizada 31 May 2018]
5. Steiner, R J. International dictionary. English / Spanish Spanish/English. Second edition. Simon & Schuster´s, Inc. Webster's New World; USA; 1997; p. 604.