Parker, G. (1981). The logic of unity: A geography of the European Economic Community (3d ed.). Longman.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रParker, Geoffrey. The Logic of Unity: A Geography of the European Economic Community. 3d ed. Longman, 1981.
एमएलए (9वां संस्करण) प्रशस्ति पत्रParker, Geoffrey. The Logic of Unity: A Geography of the European Economic Community. 3d ed. Longman, 1981.
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