Hart, H. L. A., Bulloch, P. A., & Raz, J. (2012). The concept of law (3rd ed.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Hart, H. L. A., Penelope A. Bulloch, agus Joseph Raz. The Concept of Law. 3rd ed. Oxford: Oxford University Press, 2012.
Lua MLA (9ú heag.)Hart, H. L. A., et al. The Concept of Law. 3rd ed. Oxford University Press, 2012.
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