Gallup Management Journal. Gallup Poll News Service.
Chicago-čujuhus (17. p.)Gallup Management Journal. Gallup Poll News Service.
MLA-čujuhus (9. p.)Gallup Management Journal. Gallup Poll News Service.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.