Παραπομπή APA

European Commission. (1999). EXTRA2: An assessment of European travel behaviour. Luxembourg: Office for Official Publications of the European Communities.

Παραπομπή Chicago Style

European Commission. EXTRA2: An Assessment of European Travel Behaviour. Luxembourg: Office for Official Publications of the European Communities, 1999.

Παραπομπή MLA

European Commission. EXTRA2: An Assessment of European Travel Behaviour. Luxembourg: Office for Official Publications of the European Communities, 1999.

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