APA
Sigmund Paul E,, . (1971). Natural law in political thought. Cambridge: Winthrop Publishers Inc.
Chicago
Sigmund Paul E,, . 1971. Natural law in political thought. Cambridge: Winthrop Publishers Inc.
Harvard
Sigmund Paul E,, . (1971). Natural law in political thought. Cambridge: Winthrop Publishers Inc.
MLA
Sigmund Paul E,, . Natural law in political thought. Cambridge: Winthrop Publishers Inc. 1971.