Welch, G. F. (1983). Improvability of poor pitch singing: Experiments in feedback. University of London.
Chicago-referens (17:e uppl.)Welch, Graham F. Improvability of Poor Pitch Singing: Experiments in Feedback. University of London, 1983.
MLA-referens (8:e uppl.)Welch, Graham F. Improvability of Poor Pitch Singing: Experiments in Feedback. University of London, 1983.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.