Levin Richard I. (2008). Statistics for Management. Pearson.
Lua i Stíl Chicago (17ú heag.)Levin Richard I. Statistics for Management. New Delhi: Pearson, 2008.
Lua MLA (9ú heag.)Levin Richard I. Statistics for Management. Pearson, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.