Thygerson, R. W. (1978). An essay on choral diction: Two equal parts with piano. Heritage Music Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThygerson, Robert W. An Essay on Choral Diction: Two Equal Parts with Piano. Dayton, Ohio: Heritage Music Pub, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रThygerson, Robert W. An Essay on Choral Diction: Two Equal Parts with Piano. Heritage Music Pub, 1978.
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