APA (7 वां संस्करण) प्रशस्ति पत्र
Barnard, C. (2016). The substantive law of the EU: The four freedoms (5th ed.). Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Barnard, Catherine. The Substantive Law of the EU: The Four Freedoms. 5th ed. Oxford, United Kingdom: Oxford University Press, 2016.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Barnard, Catherine. The Substantive Law of the EU: The Four Freedoms. 5th ed. Oxford University Press, 2016.
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