Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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