LEVIN, R. I. (1994). Statistics For Management Richard I. Levin. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)LEVIN, Richard I. Statistics For Management Richard I. Levin. Prentice-Hall, 1994.
Lua MLA (8ú heag.)LEVIN, Richard I. Statistics For Management Richard I. Levin. Prentice-Hall, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.