1. CNTK, work nr 4127/12, „Bieżąca analiza prac AEIF i ERA w ramach Zespołu ds. Interoperacyjności. Raport zbiorczy z prac Zespołu ds. Interoperacyjności”, Warszawa, January 2006.
2. EU Commission, decision no 2012/88/EU from 25 January 2012, „on the technical specification for interoperability relating to the subsystems "control" trans-European railway system”, Dz. U. L 51 z 23.2.2012.
3. EU Commission, decision no 2015/14 from 5 January 2015, amending Decision 2012/88/EU on the technical specification for interoperability relating to the subsystems "control" trans-European railway system.
4. EU Commission, regulation no 1299/2014 from 18 November 2014, concerning the technical specifications for interoperability relating to the 'infrastructure' railway system in the EU;
5. EU Commission, regulation no 1300/2014 from 18 November 2014, on the technical specifications for interoperability relating to the availability of the rail system of the Union for disabled persons and persons with reduced mobility;