Firth, P. G., Zheng, H., Windsor, J. S., Sutherland, A. I., Imray, C. H., Moore, G. W. K., . . . Salisbury, R. A. (2008). Mortality on Mount Everest, 1921-2006: Descriptive study. BMJ Publishing Group Ltd.

Firth, Paul G., Hui Zheng, Jeremy S. Windsor, Andrew I. Sutherland, Christopher H. Imray, G W K. Moore, John L. Semple, Robert C. Roach, e Richard A. Salisbury. Mortality On Mount Everest, 1921-2006: Descriptive Study. BMJ Publishing Group Ltd, 2008.

Firth, Paul G., et al. Mortality On Mount Everest, 1921-2006: Descriptive Study. BMJ Publishing Group Ltd, 2008.