American Association for Public Opinion Research. (1937). Public Opinion Quarterly. University of Chicago Press.
Lua i Stíl Chicago (17ú heag.)American Association for Public Opinion Research. Public Opinion Quarterly. Chicago, Ill: University of Chicago Press, 1937.
Lua MLA (8ú heag.)American Association for Public Opinion Research. Public Opinion Quarterly. University of Chicago Press, 1937.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.