Oklahoma data book. Bureau of Business Research, University of Oklahoma.
Lua i Stíl Chicago (17ú heag.)Oklahoma Data Book. Norman: Bureau of Business Research, University of Oklahoma.
Lua MLA (8ú heag.)Oklahoma Data Book. Bureau of Business Research, University of Oklahoma.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.