Dyfyniad APA

Duchan, J. S. (2012). Powerful voices: The musical and social world of collegiate a cappella. University of Michigan Press.

Dyfyniad Arddull Chicago

Duchan, Joshua S. Powerful Voices: The Musical and Social World of Collegiate a Cappella. Ann Arbor: University of Michigan Press, 2012.

Dyfyniad MLA

Duchan, Joshua S. Powerful Voices: The Musical and Social World of Collegiate a Cappella. University of Michigan Press, 2012.

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