Παραπομπή APA
Westerhuis, A., Heitmann, G., & European Centre for the Development of Vocational Training. (2001). European structures of qualification levels. Luxembourg: Office for Official Publications of the European Communities.
Παραπομπή Chicago StyleWesterhuis, Anneke., Gunter Heitmann, and European Centre for the Development of Vocational Training. European Structures of Qualification Levels. Luxembourg: Office for Official Publications of the European Communities, 2001.
Παραπομπή MLAWesterhuis, Anneke., Gunter Heitmann, and European Centre for the Development of Vocational Training. European Structures of Qualification Levels. Luxembourg: Office for Official Publications of the European Communities, 2001.
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