Gallup Management Journal. Gallup Poll News Service.
Lua i Stíl Chicago (17ú heag.)Gallup Management Journal. Gallup Poll News Service.
Lua MLA (9ú heag.)Gallup Management Journal. Gallup Poll News Service.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.