IUCN Kırmızı Liste Sınıfları ve Ölçütleri (ver. 3.1)
2005
The threatened species categories used in Red Data Books and Red Lists have been in place for almost 30 years. The IUCN Red List Categories and Criteria provide an easily and widely understood system for classifying species at high risk of global extinction, so as to focus attention on conservation measures designed to protect them.