1. Convention on Biological Diversity (CBD). Article 2. Use of terms; 2020. www.cbd.int.
2. Conserving Biological Diversity in Our National Forests;Norse,1986
3. Basel Zoo and its native biodiversity between the enclosures: a new strategy of cooperation with academic institutions;Baur;Int Zoo Yb,2011
4. Vielfalt zwischen den Gehegen: wildlebende Tiere und Pflanzen im Zoo Basel;Baur,2008
5. Geschäftsbericht 2019,2020