1. ISO Guide 33 (2015) Reference materials—good practice in using reference materials. International Organisation for Standardisation (ISO), Geneva, Switzerland
2. ISO 17034 (2016) General requirements for the competence of reference material producers. International Organisation for Standardisation (ISO), Geneva, Switzerland
3. ISO Guide 35 (2017) Reference materials—guidance for characterisation and assessment of homogeneity and stability. International Organisation for Standardisation (ISO), Geneva, Switzerland
4. ISO/IEC Guide 99 (2007) International vocabulary of metrology—basic and general concepts and associated terms (VIM). International Organisation for Standardisation (ISO), Geneva, Switzerland
5. ISO Guide 35 (2006) Reference materials—guidance for characterisation and assessment of homogeneity and stability. International Organisation for Standardisation (ISO), Geneva, Switzerland