APA
(1951). State in theory and practice. London, UK: George Allen and Unwin Ltd.
Chicago
1951. State in theory and practice. London, UK: George Allen and Unwin Ltd.
Harvard
(1951). State in theory and practice. London, UK: George Allen and Unwin Ltd.
MLA
State in theory and practice. London, UK: George Allen and Unwin Ltd. 1951.