Não informado. (2000). The Presidency. American Council on Education.
Chicago-referens (17:e uppl.)Não informado. The Presidency. Washington: American Council on Education, 2000.
MLA-referens (8:e uppl.)Não informado. The Presidency. American Council on Education, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.