Hart, H. L. A. (2020). Concept of law (3rd.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Hart, H. L. A. Concept of Law. 3rd. UK: Oxford University Press, 2020.
Lua MLA (9ú heag.)Hart, H. L. A. Concept of Law. 3rd. Oxford University Press, 2020.
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