APA-referens (7:e uppl.)

Boyd Group Services Inc. Company Profile. MarketLine, a Progressive Digital Media business.

Chicago-referens (17:e uppl.)

Boyd Group Services Inc. Company Profile. MarketLine, a Progressive Digital Media business.

MLA-referens (9:e uppl.)

Boyd Group Services Inc. Company Profile. MarketLine, a Progressive Digital Media business.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.