1. International Organization for Standardization (1982) ISO 6983/1 numerical control of machines—program format and definition of address words—data format for positioning, line and contouring control systems. International Organization for Standardization, Geneva
2. Kramer TR, Proctor FM (1995) The NIST RS274/NGC interpreter version 2. NISTIR 5739, (NIST: Gaithersburg, MD)
3. International Organization for Standardization (2004) ISO 14649-1 industrial automation systems and integration—data model for computerized numerical controllers—overview and fundamental principles. International Organization for Standardization, Geneva
4. International Organization for Standardization (2004) ISO 10303-238 industrial automation systems and integration—product data representation and exchange—application protocols: application interpreted model for computerized numerical controllers. International Organization for Standardization, Geneva
5. International Organization for Standardization (1994) ISO 10303-203 industrial automation systems and integration—product data representation and exchange—application protocol: configuration controlled 3D designs of mechanical parts and assemblies. International Organization for Standardization, Geneva.