APA

hart h., .the concerpt of law. london: the english language book society oxfored university press.

Chicago

hart h.l, .the concerpt of law. london: the english language book society oxfored university press.

Harvard

hart h., .the concerpt of law. london: the english language book society oxfored university press.

MLA

hart h.l, .london: the english language book society oxfored university press. .