APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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