There is a collection of e-books on the Oxford Scholarship Online database. Once on the site, click on the subject heading Political Science and then enter search terms.
Oxford Scholarship Online is a vast and rapidly expanding cross-searchable library which offers quick and easy access to the full text of Oxford University Press ebooks. The University of Melbourne Library has purchased access to selected subject collections within Oxford Scholarship Online - Business and management; Economics and finance; Law; Philosophy; Political science; Public health and epidemiology.