APA

Hart H L A,, . (1961). The concept of law. Oxford: Oxford University Press.

Chicago

Hart H L A,, . 1961. The concept of law. Oxford: Oxford University Press.

Harvard

Hart H L A,, . (1961). The concept of law. Oxford: Oxford University Press.

MLA

Hart H L A,, . The concept of law. Oxford: Oxford University Press. 1961.