Barilleaux. The Unitary Executive and the Modern Presidency. Texas A&M University Press.
Čikaški stil citiranja (17. izdanje)Barilleaux. The Unitary Executive and the Modern Presidency. Texas A&M University Press.
MLA način citiranja (8. izdanje)Barilleaux. The Unitary Executive and the Modern Presidency. Texas A&M University Press.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.