Resumen
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Referencias
COLLAR NJ Y ANDREW P (1988) Birds to watch: the ICBP world check-list of threatened birds. International Council for Bird Preservation, Cambridge.
MACE GM Y LANDE R (1991) Assessing extinction threats: toward a re-evaluation of IUCN threatened species categories. Conservation Biology 5:148–157.
MACE GM, COLLAR N, COOKE J, GASTON K, GINSBERG J, LEADER-WILLIAMS N, MAUNDER N Y MILNER-GULLAND EJ (1992) The development of new criteria for listing species on the IUCN Red List. Species 19:16–22.
MACE GM Y STUART SN (1994) Draft IUCN Red List categories, version 2.2. Species 21-22:13–24.
COLLAR NJ, CROSBY MJ Y STATTERFIELD AJ (1994) Birds to watch II: the world list of threatened birds. BirdLife International, Cambridge.

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