Gaya APA
Hart, H.
(1989).
Law, liberty and morality, 11th ed. Cet.pertama 1963.
.
New York dsl:
Oxford UP.
Gaya MLA
Hart, H.L.A..
"Law, liberty and morality, 11th ed. Cet.pertama 1963. ".
New York dsl:
Oxford UP,
1989.
Buku.