BS PD 6532-2:1992 Reference materials. Guide to the contents of certificates of reference materials-Guide to the contents of certificates of reference materials
2015BS PD ISO GUIDE 31:2015 Reference materials. Contents of certificates, labels and accompanying documentation
2000BS PD 6532-2:2000 Reference materials. Guide to the contents of certificates of reference materials-Guide to the contents of certificates and labels of reference materials
1992BS PD 6532-2:1992 Reference materials. Guide to the contents of certificates of reference materials-Guide to the contents of certificates of reference materials