Booth, Sara, and Deborah Dudgeon. "A palliative approach to the breathless patient." Dyspnoea in Advanced Disease: A guide to clinical management. : Oxford University Press, 2005-11-24. Oxford Scholarship Online. 2011-11-17. Date Accessed 18 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198530039.001.0001/acprof-9780198530039-chapter-14>.
Booth, S., & Dudgeon, D.(2005-11-24). A palliative approach to the breathless patient. In Dyspnoea in Advanced Disease: A guide to clinical management. : Oxford University Press. Retrieved 18 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198530039.001.0001/acprof-9780198530039-chapter-14.
Booth, Sara, and Deborah Dudgeon. "A palliative approach to the breathless patient." In Dyspnoea in Advanced Disease: A guide to clinical management. : Oxford University Press, 2005-11-24. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198530039.001.0001/acprof-9780198530039-chapter-14.
Booth S, Dudgeon D. A palliative approach to the breathless patient. In: Booth S, Dudgeon D. Dyspnoea in Advanced Disease: A guide to clinical management. Oxford University Press; 2005. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198530039.001.0001/acprof-9780198530039-chapter-14. Accessed June 18, 2013.