APA

Hart H. L. A., . (1961). The concept of law. London: Oxford at the Clarendon Press.

Chicago

Hart H L A, . 1961. The concept of law. London: Oxford at the Clarendon Press.

Harvard

Hart H. L. A., . (1961). The concept of law. London: Oxford at the Clarendon Press.

MLA

Hart H L A, . The concept of law. London: Oxford at the Clarendon Press. 1961.