Welch, G. F. (1983). Improvability of poor pitch singing: Experiments in feedback. University of London.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWelch, Graham F. Improvability of Poor Pitch Singing: Experiments in Feedback. University of London, 1983.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWelch, Graham F. Improvability of Poor Pitch Singing: Experiments in Feedback. University of London, 1983.
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