APA-viite (7. p.)
Barnard, C. (2016). The substantive law of the EU: The four freedoms (5th ed.). Oxford University Press.
Chicago-viite (17. p.)
Barnard, Catherine. The Substantive Law of the EU: The Four Freedoms. 5th ed. Oxford, United Kingdom: Oxford University Press, 2016.
MLA-viite (9. p.)
Barnard, Catherine. The Substantive Law of the EU: The Four Freedoms. 5th ed. Oxford University Press, 2016.
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