Edgerton, M. E. (2015). The 21st-century voice: Contemporary and traditional extra-normal voice (Second edition.). Rowman & Littlefield.
Chicago-Zitierstil (17. Ausg.)Edgerton, Michael Edward. The 21st-century Voice: Contemporary and Traditional Extra-normal Voice. Second edition. Lanham, Maryland: Rowman & Littlefield, 2015.
MLA-Zitierstil (9. Ausg.)Edgerton, Michael Edward. The 21st-century Voice: Contemporary and Traditional Extra-normal Voice. Second edition. Rowman & Littlefield, 2015.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.