Lua APA (7ú heag.)
ebrary, Inc, & Newport, F. (2010). The Gallup Poll: Public opinion 2009. Rowman & Littlefield.
Lua i Stíl Chicago (17ú heag.)
ebrary, Inc, agus Frank Newport. The Gallup Poll: Public Opinion 2009. Ladnham: Rowman & Littlefield, 2010.
Lua MLA (9ú heag.)
ebrary, Inc, agus Frank Newport. The Gallup Poll: Public Opinion 2009. Rowman & Littlefield, 2010.
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