Keller, G. (2005). Statistics for management and economicsGerald Keller. Thomson.
Lua i Stíl Chicago (17ú heag.)Keller, Gerald. Statistics for Management and EconomicsGerald Keller. Thomson, 2005.
Lua MLA (8ú heag.)Keller, Gerald. Statistics for Management and EconomicsGerald Keller. Thomson, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.