Travis, R. (2001). Air transport liberalisation in the European Community 1987-1992: A case of integration. Uppsala University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTravis, Robin. Air Transport Liberalisation in the European Community 1987-1992: A Case of Integration. Uppsala: Uppsala University, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTravis, Robin. Air Transport Liberalisation in the European Community 1987-1992: A Case of Integration. Uppsala University, 2001.
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