1. ANWASME Y14,5-1994, Dimensioning and Tolerancing,1995
2. 2 ISO 1101, 1983 Technical Drawings-Geometrical Tolerancing - Toleranced Characteristics and Symbols - Examples of Indication and Interpretation, International Organization for Standardization, Geneva.
3. Results of the CIRP-form intercomparison 1996–1998;Jusko;Annals of the CIRP,1999
4. 4 ISO 9000–9004, 2000, Quality Management Systems and supporting documents, ANSI/ASME, New York.
5. 5 ISO 14253–1, 1998, Geometrical Product Specifications (GPS) - Inspection by measurement of workpieces and measuring instruments - Part 1: Decision rules for proving conformance or nonconformance with specification, International Organization for Standardization, Geneva.