Appelman, D. R. (1986). The science of vocal pedagogy: Theory and application (1st Midland book ed.). Indiana University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAppelman, D. Ralph. The Science of Vocal Pedagogy: Theory and Application. 1st Midland book ed. Bloomington: Indiana University Press, 1986.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAppelman, D. Ralph. The Science of Vocal Pedagogy: Theory and Application. 1st Midland book ed. Indiana University Press, 1986.
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