Clark, David. "The expansive years (1968–1985)." Cicely Saunders – Founder of the Hospice Movement: Selected letters 1959–1999. : Oxford University Press, 2005-05-12. Oxford Scholarship Online. 2011-11-17. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198569695.001.0001/acprof-9780198569695-chapter-3>.
Clark, D.(2005-05-12). The expansive years (1968–1985). In Cicely Saunders – Founder of the Hospice Movement: Selected letters 1959–1999. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198569695.001.0001/acprof-9780198569695-chapter-3.
Clark, David. "The expansive years (1968–1985)." In Cicely Saunders – Founder of the Hospice Movement: Selected letters 1959–1999. : Oxford University Press, 2005-05-12. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198569695.001.0001/acprof-9780198569695-chapter-3.
Clark D. The expansive years (1968–1985). In: Clark D. Cicely Saunders – Founder of the Hospice Movement: Selected letters 1959–1999. Oxford University Press; 2005. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198569695.001.0001/acprof-9780198569695-chapter-3. Accessed May 22, 2013.