Business Cycle Theory. : Oxford University Press, 2002-08-22. Oxford Scholarship Online. 2011-10-03. Date Accessed 18 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199256815.001.0001/acprof-9780199256815>.
(2002-08-22). Business Cycle Theory. : Oxford University Press. Retrieved 18 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199256815.001.0001/acprof-9780199256815.
Business Cycle Theory. : Oxford University Press, 2002-08-22. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199256815.001.0001/acprof-9780199256815.
Arnold LG. Business Cycle Theory. Oxford University Press; 2002. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199256815.001.0001/acprof-9780199256815. Accessed May 18, 2013.