1. World Charter for Nature,1982
2. UNCED—United Nations Conference on Environment and Developmentwww.ciesin.org/TG/P1/TREATY/unced.html
3. World Summit on Sustainable Development Reporthttps://www.un.org/ga/search/view_doc.asp?symbol=A/CONF.199/20/Corr.1&Lang=E
4. UNCED—United Nations Conference of Sustainable Development, Rio +20https://sustainabledevelopment.un.org/rio20/futurewewant
5. UNSD—SGD Indicators Global Databasehttps://unstats.un.org/sdgs/indicators/database/