Παραπομπή APA
European Commission. (1997). Improved structure and organization for urban transport operations of passengers in Europe: Isotope. Luxembourg: Office for Official Publications of the European Communities.
Παραπομπή Chicago StyleEuropean Commission. Improved Structure and Organization for Urban Transport Operations of Passengers in Europe: Isotope. Luxembourg: Office for Official Publications of the European Communities, 1997.
Παραπομπή MLAEuropean Commission. Improved Structure and Organization for Urban Transport Operations of Passengers in Europe: Isotope. Luxembourg: Office for Official Publications of the European Communities, 1997.
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