LEVIN, R. J., & LEVIN, R. J. (1991). Statistics For Management / Richard J. Levin. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)LEVIN, Richard J., agus Richard J. LEVIN. Statistics For Management / Richard J. Levin. Prentice-Hall, 1991.
Lua MLA (8ú heag.)LEVIN, Richard J., agus Richard J. LEVIN. Statistics For Management / Richard J. Levin. Prentice-Hall, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.