Four Parts, No Waiting: A Social History of American Barbershop Harmony. : Oxford University Press, 2003-02-20. Oxford Scholarship Online. 2011-10-03. Date Accessed 24 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195116724.001.0001/acprof-9780195116724>.
(2003-02-20). Four Parts, No Waiting: A Social History of American Barbershop Harmony. : Oxford University Press. Retrieved 24 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195116724.001.0001/acprof-9780195116724.
Four Parts, No Waiting: A Social History of American Barbershop Harmony. : Oxford University Press, 2003-02-20. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195116724.001.0001/acprof-9780195116724.
Averill G. Four Parts, No Waiting: A Social History of American Barbershop Harmony. Oxford University Press; 2003. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195116724.001.0001/acprof-9780195116724. Accessed May 24, 2013.