Levin, R. I., & Rubin, D. S. (1998). Statistics for management (7th ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Levin, Richard I., agus David S. Rubin. Statistics for Management. 7th ed. Upper Saddle River, N.J. ; New Delhi: Prentice Hall, 1998.
Lua MLA (8ú heag.)Levin, Richard I., agus David S. Rubin. Statistics for Management. 7th ed. Prentice Hall, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.