Written by: Anna Nicholson | Last reviewed: July 2015.
- Merck Manuals. “Chronic Obstructive Pulmonary Disease.” Available at: http://www.merckmanuals.com/professional/pulmonary_disorders/chronic_obstructive_pulmonary_disease_and_related_disorders/chronic_obstructive_pulmonary_disease_copd.html [Accessed 4 February 2015.]
- Haiken M. “Breathing trouble? 7 Signs your lungs are in danger.” Available at: https://www.caring.com/articles/copd-signs-and-symptoms [Accessed 4 February 2015.]
- Lung Institute. “Morning Headaches with COPD.” Available at: http://lunginstitute.com/blog/morning-headaches-with-copd/ [Accessed 4 February 2015.]
- American Thoracic Society / European Respiratory Society Task Force. Standards for the Diagnosis and Management of Patients with COPD [Internet]. New York: American Thoracic Society;2004 [updated 2005 September 8].