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.