Schenker, Heinrich. "On Practicing." The Art of Performance. : Oxford University Press, 2002-06-20. Oxford Scholarship Online. 2008-05-01. Date Accessed 21 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195151510.001.0001/acprof-9780195151510-chapter-12>.
Schenker, H.(2002-06-20). On Practicing. In The Art of Performance. : Oxford University Press. Retrieved 21 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195151510.001.0001/acprof-9780195151510-chapter-12.
Schenker, Heinrich. "On Practicing." In The Art of Performance. : Oxford University Press, 2002-06-20. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195151510.001.0001/acprof-9780195151510-chapter-12.
Schenker H. On Practicing. In: Schenker H, Esser H, Scott IS. The Art of Performance. Oxford University Press; 2002. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195151510.001.0001/acprof-9780195151510-chapter-12. Accessed May 21, 2013.