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American Chemical Society www.acs.org
American National Standards Institute (ANSI) www.ansi.org
American Society for Testing and Materials (ASTM) www.astm.org
American Society of Quality Control (ASQC) www.asq.org
Association of Official Agricultural Chemists www.aoac.org
Avaliação da Conformidade European Organization for Testing and Certification
Bureau International des Poids et Mesures www.bipm.fr
Chemical Abstracts Service (CAS) www.cas.org
COMAR - The Database for Certified Reference Materials www.bam.de
Comitê Consultivo para Quantidade de Matéria Substance - CCQM www.bipm.fr
Co-Operation on International Traceability in Analytical Chemistry - CITAC www.irmm.jrc.be
