Gallup International, Inc, & American Institute of Public Opinion. Gallup political index. Gallup International, Inc.
Chicago Style (17th ed.) CitationGallup International, Inc, and American Institute of Public Opinion. Gallup Political Index. Princeton, N.J.: Gallup International, Inc.
MLA (9th ed.) CitationGallup International, Inc, and American Institute of Public Opinion. Gallup Political Index. Gallup International, Inc.
Warning: These citations may not always be 100% accurate.