APA

Barker E., . (1951). Principles of social and political theory. : Clarendon Press, Oxford.

Chicago

Barker Ernest, . 1951. Principles of social and political theory. : Clarendon Press, Oxford.

Harvard

Barker E., . (1951). Principles of social and political theory. : Clarendon Press, Oxford.

MLA

Barker Ernest, . Principles of social and political theory. : Clarendon Press, Oxford. 1951.