APA (7th ed.) Citation

American Institute of Public Opinion & Gallup International, Inc. (1967). The Gallup opinion index. Gallup Poll [etc.].

Chicago Style (17th ed.) Citation

American Institute of Public Opinion and Inc Gallup International. The Gallup Opinion Index. Princeton, N.J.: Gallup Poll [etc.], 1967.

MLA (9th ed.) Citation

American Institute of Public Opinion and Inc Gallup International. The Gallup Opinion Index. Gallup Poll [etc.], 1967.