Παραπομπή APA
European Commission. (1997). Validation process for users' requirements in air traffic operations. Luxembourg: Office for Official Publications of the European Communities.
Παραπομπή Chicago StyleEuropean Commission. Validation Process for Users' Requirements in Air Traffic Operations. Luxembourg: Office for Official Publications of the European Communities, 1997.
Παραπομπή MLAEuropean Commission. Validation Process for Users' Requirements in Air Traffic Operations. Luxembourg: Office for Official Publications of the European Communities, 1997.
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