APA (7th ed.) Citation

Hart, H. L. A. (1961). The concept of law. Clarendon Press.

Chicago Style (17th ed.) Citation

Hart, H. L. A. The Concept of Law. Oxford: Clarendon Press, 1961.

MLA (9th ed.) Citation

Hart, H. L. A. The Concept of Law. Clarendon Press, 1961.