| http://www.turkak.org.tr | Türk Akreditasyon Kurumu (TÜRKAK) | 
| http://www.ume.tubitak.gov.tr | Ulusal Metroloji Enstitüsü (UME) | 
| http://www.tse.org.tr | Türk Standardları Enstitüsü (TSE) | 
| http://www.european-accreditation.org | Europan Co-operation for Accreditation (EA) | 
| http://www.ilac.org | International Laboratory Accreditation Cooperation (ILAC) | 
| http://www.bipm.org | Bureau International des Poids et Mesures - France (BIPM) | 
| http://www.ptb.de | Physikalisch - Technischen Bundesanstalt - Germany (PTB) | 
| http://www.nist.gov | National Institute of Standards and Technology - USA (NIST) | 
| http://www.ukas.com | United Kingdom Accreditation Service (UKAS) | 
| http://www.eurolab.org | European Federation of National Associations of Measurement, Testing and Analitical Laboratories (EUROLAB) | 
| http://www.npl.co.uk | National Physical Laboratory - England (NPL) | 
| http://www.cenorm.be | European Committee for Standardization - Belgium (CEN) | 
| http://www.dkd.eu/inhalt.php?id=28 | DKD Kalibrasyon rehberleri (DKD) | 
| http://www.astm.org | American Society for Testing and Materials - USA (ASTM) | 
| http://www.iso.ch | International Organisation for Standardization (ISO) | 
| http://www.euramet.org/index.php?id=calibration-guides | Kalibrasyon Rehberleri (EURAMET) | 
| https://www.vdi.de/en/home | VDI Rehberleri (VDI/VDE/DGQ) |