APA
Gierke O. v., Barker E. & Troeltsch E. (1960). Natural law and the theory of society. Beacon Hill (Boston): Beacon Press.
Chicago
Gierke Otto von, Barker Ernest and Troeltsch Ernst. 1960. Natural law and the theory of society. Beacon Hill (Boston): Beacon Press.
Harvard
Gierke O. v., Barker E. and Troeltsch E. (1960). Natural law and the theory of society. Beacon Hill (Boston): Beacon Press.
MLA
Gierke Otto von, Barker Ernest and Troeltsch Ernst. Natural law and the theory of society. Beacon Hill (Boston): Beacon Press. 1960.