AOAC Technical Division on Reference Materials
http://tdrmdb.aoac.org/

GeoReM – Geological and Enviromental Reference Materials
http://georem.mpch-mainz.gwdg.de/

JCTLM - Database for Laboratory medicine and in vitro diagnostics
http://www.bipm.org/jctlm/

BIPM-Key comparison database –Metroloji Enstitüleri ve Atanmış Enstitülerin Ölçüm Kabiliyetleri Veritabanı
http://kcdb.bipm.org/

NIST –National Institute of Standards and Technology
https://www.nist.gov/srm

EC-JRC European Commission- Joint Research Center
https://crm.jrc.ec.europa.eu/

MUkit- Measurement Uncertainty Kit –Belirsizlik Hesaplaması (Yukarıdan Aşağı Yaklaşımı ile )için bir Yazılım
http://www.syke.fi/en-US/Services/Quality_and_laboratory_services/Calibration_services_and_contract_laboratory/MUkit__Measurement_Uncertainty_Kit