Siemers, D. J. (2009). Presidents and political thought. University of Missouri Press.
Citazione stile Chigago Style (17a edizione)Siemers, David J. Presidents and Political Thought. Columbia: University of Missouri Press, 2009.
Citatione MLA (9a ed.)Siemers, David J. Presidents and Political Thought. University of Missouri Press, 2009.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.