The principle set out in Article 34(1) is based on Articles 153 and 156 of the Treaty on the Functioning of the European Union, Article 12 of the European Social Charter and point 10 of the Community Charter on the rights of workers.
Tá an prionsabal a leagtar amach in Airteagal 34(1) bunaithe ar Airteagail 153 agus 156 den Chonradh ar Fheidhmiú an Aontais Eorpaigh agus ar Airteagal 12 de Chairt Shóisialta na hEorpa agus ar phointe 10 den Chairt Chomhphobail um Chearta le haghaidh Oibrithe.