Collar, N. J., Crosby, M. J., & Stattersfield, A. J. (1994). Birds to watch 2 : the world list ofthreatened birds : the official source for birds on the IUCN Red List / N.J. Collar, M.J. Crosby and A.J. Stattersfield: The world list ofthreatened birds : the official source for birds on the IUCN Red List. Birdlife International.
Chicago Style (17th ed.) CitationCollar, N. J., M. J. Crosby, and A. J. Stattersfield. Birds to Watch 2 : The World List Ofthreatened Birds : The Official Source for Birds on the IUCN Red List / N.J. Collar, M.J. Crosby and A.J. Stattersfield: The World List Ofthreatened Birds : The Official Source for Birds on the IUCN Red List. Cambridge: Birdlife International, 1994.
MLA (9th ed.) CitationCollar, N. J., et al. Birds to Watch 2 : The World List Ofthreatened Birds : The Official Source for Birds on the IUCN Red List / N.J. Collar, M.J. Crosby and A.J. Stattersfield: The World List Ofthreatened Birds : The Official Source for Birds on the IUCN Red List. Birdlife International, 1994.