APA

Barker E., . (1967). Greek political theory: Plato and his predecessors. : Methuen & Co., New York.

Chicago

Barker Ernest, . 1967. Greek political theory: Plato and his predecessors. : Methuen & Co., New York.

Harvard

Barker E., . (1967). Greek political theory: Plato and his predecessors. : Methuen & Co., New York.

MLA

Barker Ernest, . Greek political theory: Plato and his predecessors. : Methuen & Co., New York. 1967.