• The United Nations Economic Commission for Europe (UNECE) homepage: https://unece.org/transport/dangerous-goods


• Road Traffic Safety Directorate (CSDD) homepage: https://www.csdd.lv/en/certificate-for-the-carriage-of-dangerous-goods-adr/general-information


• ADR instructions in writing in different languages: https://unece.org/linguistic-versions-adr-instructions-writing