1. Fondriest.com, “Conductivity, salinity, and dissolved solid, see https://www.fondriest.com/environmental-measurements/parameters/water-quality/conductivity-salinity-tds/
2. Emerson Process Management, “Theory and appllication of conductivity,” Application Data Sheet, ADS 43-018 (2010).
3. Radiometer analytical SAS, “Conducvity Theory and Practice,” see http://www.analytical-chemistry.uoc.gr/files/items/6/618/agwgimometria_2.pdf, 2016.
4. Stability of standard electrolytic conductivity solutions in glass containers
5. KAN, “Direktori LPK Terakreditasi SNI/ISO 17025”, 2017, http://www.kan.or.id/index.php/documents/terakreditasi/doc17020/sni-iso-iec-17025/laboratorium-penguji, accessed 03/09/2019