C. David L. Orme, Richard G. Davies, Malcolm Burgess, Felix Eigenbrod, Nicola Pickup, Valerie A. Olson, Andrea J. Webster, Tzung-Su Ding, Pamela C. Rasmussen, Robert S. Ridgely, Ali J. Stattersfield, Peter M. Bennett, Tim M. Blackburn, Kevin J. Gaston, Ian P. F. Owens,
Global hotspots of species richness are not congruent with endemism or threat Nature. ,vol. 436, pp. 1016- 1019 ,(2005) ,
10.1038/NATURE03850