Schmidt, S. W., & Shelley, M. C. (1991). American government and politics today. West.
Citazione stile Chigago Style (17a edizione)Schmidt, Steffen W., e Mack C. Shelley. American Government and Politics Today. Saint Paul: West, 1991.
Citatione MLA (9a ed.)Schmidt, Steffen W., e Mack C. Shelley. American Government and Politics Today. West, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.