Chafe, Eric. "The Desire Music." The Tragic and the Ecstatic:: The Musical Revolution of Wagner’s Tristan and Isolde. : Oxford University Press, 2008-08-12. Oxford Scholarship Online. 2011-10-03. Date Accessed 24 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195343007.001.0001/acprof-9780195343007-chapter-6>.
Chafe, E.(2008-08-12). The Desire Music. In The Tragic and the Ecstatic:: The Musical Revolution of Wagner’s Tristan and Isolde. : Oxford University Press. Retrieved 24 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195343007.001.0001/acprof-9780195343007-chapter-6.
Chafe, Eric. "The Desire Music." In The Tragic and the Ecstatic:: The Musical Revolution of Wagner’s Tristan and Isolde. : Oxford University Press, 2008-08-12. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195343007.001.0001/acprof-9780195343007-chapter-6.
Chafe E. The Desire Music. In: Chafe. The Tragic and the Ecstatic:: The Musical Revolution of Wagner’s Tristan and Isolde. Oxford University Press; 2008. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195343007.001.0001/acprof-9780195343007-chapter-6. Accessed May 24, 2013.