Crockett, D. A. (2002). The opposition presidency: Leadership and the constraints of history. Texas A&M University Press.
Chicago-Zitierstil (17. Ausg.)Crockett, David A. The Opposition Presidency: Leadership and the Constraints of History. College Station: Texas A&M University Press, 2002.
MLA-Zitierstil (9. Ausg.)Crockett, David A. The Opposition Presidency: Leadership and the Constraints of History. Texas A&M University Press, 2002.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.