Brendan, O., Patrick, D.(1987).Theories of the state : the politics of liberal democracy / Patrick Dunleavy, Brendan O'leary .London:Macmillan.
Gaya MLA
O\'leary, Brendan., Dunleavy, Patrick."Theories of the state : the politics of liberal democracy / Patrick Dunleavy, Brendan O'leary".London:Macmillan,1987.Textbook.