Cita APA (7th ed.)
Abbott, P. (2011). The challenge of the American presidency: Washington to Obama (2nd ed.). Lexington Books.
Cita Chicago (17th ed.)
Abbott, Philip. The Challenge of the American Presidency: Washington to Obama. 2nd ed. Lanham, Md.: Lexington Books, 2011.
Cita MLA (9th ed.)
Abbott, Philip. The Challenge of the American Presidency: Washington to Obama. 2nd ed. Lexington Books, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.