Παραπομπή σε μορφή APA (7η εκδ.)

Westerhuis, A. European structures of qualification levels. Office for Official Publications of the European Communities.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Westerhuis, Anneke. European Structures of Qualification Levels. Luxembourg: Office for Official Publications of the European Communities.

Παραπομπή σε μορφή MLA (8th εκδ.)

Westerhuis, Anneke. European Structures of Qualification Levels. Office for Official Publications of the European Communities.