- Author: Skornicka Joseph Edward
- Language: English
- Year: 1938
- Author: Safonov Vassili Ilyich, Rehberg Willy (ed.)
- Language: German
- Year: 1931
- Author: Phillips Pamelia Sue
- Language: English
- Year: 2012
- Author: Phillips Pamelia Sue
- Language: English
- Year: 2012
Head first : the language of the head voice : a concise study of learning to sing in the head voice
epub
- Author: Striny Denes
- Language: English
- Year: 2007