Cita APA (7th ed.)
ebrary, Inc, & Newport, F. (2010). The Gallup Poll: Public opinion 2009. Rowman & Littlefield.
Cita Chicago (17th ed.)
ebrary, Inc, i Frank Newport. The Gallup Poll: Public Opinion 2009. Ladnham: Rowman & Littlefield, 2010.
Cita MLA (9th ed.)
ebrary, Inc, i Frank Newport. The Gallup Poll: Public Opinion 2009. Rowman & Littlefield, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.