Further details on the production, certification and use of reference materials are given in the range of guides issued by the International Organisation for Standardisation:
ISO Guide 30: 1992 - Terms and definitions used in connection with reference materials
ISO Guide 31: 1996- Contents of certificates of reference materials
ISO Guide 32: 1997 - Calibration of chemical analysis and use of certified reference materials
ISO Guide 33: 1989 - Uses of certified reference materials (under revision)
ISO Guide 34: 1996 - General requirements for the competence of reference materials producers
ISO Guide 35: 1989 - Certification of reference materials - General and statistical principles (under revision)
In addition many reports, papers and books on reference materials are available - see Publications Section of this site