@inbook{ERMS:SourceID:421687, author = {IUCN}, title = {1994 IUCN Red List Categories and Criteria: Version 2.3. First edition.}, url = {https://web.archive.org/web/20140722073142/http://www.iucnredlist.org/technical-documents/categories-and-criteria/1994-categories-criteria#categories}, year = {1994} }