Duverger, M., Pressure groups, & Wagover, R. (1972). Party politics and pressure groups: A comparative introduction. Thomas Nelson.
Citazione stile Chigago Style (17a edizione)Duverger, Maurice, Pressure groups, e Robert Wagover. Party Politics and Pressure Groups: A Comparative Introduction. London, Eng: Thomas Nelson, 1972.
Citatione MLA (9a ed.)Duverger, Maurice, et al. Party Politics and Pressure Groups: A Comparative Introduction. Thomas Nelson, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.