== Udvalg af publikationer ==
* 1990: ''Birds of the High Andes: A manual to the birds of the temperate zone of the Andes and Patagonia, South America'' (med [[Jon Fjeldså]])
* 1991: ''Avifauna of the Temperate Zone of the Ecuadorean Andes: Technical Report Over Surveys in 1990-91 with Reviews of Previous Ornithological Work in the Zone''. Zoological Museum, University of Copenhagen, 1991
* 1992: ''Threatened Birds of the Americas: The ICBP/IUCN Red Data Book'' (med Nigel Collar)
* 1998: ''Avian Diversity in the Ecuadorian Andes: An Atlas of Distribution of Andean Forest Birds and Conservation Priorities''. Centre for Research on the Cultural and Biological Diversity of Andean Rainforests (DIVA)
* 2003: ''Handbook of the Birds of the World: Broadbills to Tapaculos''. Band 8.
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