1. Global Strategy for the Diagnosis, Management and Prevention of COPD, Global Initiative for Chronic Obstructive Lung Disease (GOLD) 2013. Available from: http://www.goldcopd.org/.
2. DK McKenzie, M Abramson, AJ Crockett, E Dabscheck, N Glasgow, S Jenkins, C McDonald, R Wood-Baker, I Yang, Frith PA on behalf of The Australian Lung Foundation. The COPD-X Plan: Australian and New Zealand Guidelines for the management of Chronic Obstructive Pulmonary Disease V2.32, 2012.
3. Broad J, Jackson R. Chronic Obstructive Pulmonary Disease and Lung Cancer in New Zealand. Auckland: UniServices; 2003.
4. Health outcomes following treatment for six months with once daily tiotropium compared with twice daily salmeterol in patients with COPD
5. Improved health outcomes in patients with COPD during 1 yr's treatment with tiotropium