1. ISO 8258 (1991) Shewhart control charts. International Organisation for Standardisation, Geneva
2. ISO 7870-1 (2007) Control charts—part 1: general guidelines. International Organisation for Standardisation, Geneva
3. ISO 7873 (1993) Control charts for arithmetic average and warning limits. International Organisation for Standardisation, Geneva
4. Thompson M, Wood R (1995) Harmonised guidelines for internal quality control in analytical chemistry laboratories. Pure Appl Chem 67:649–666
5. Hovind H, Magnussen B, Krysell M, Lund U, Mäkinen I (2011) Internal quality control handbook for chemical laboratories. Nordtest Technical Report 569, 4th edn (Free download from www.nordtest.info )