McClave, J. T., & Dietrich, F. H. (1991). Statistics (5th.ed.). Dellen.
Lua i Stíl Chicago (17ú heag.)McClave, James T., agus Frank H. Dietrich. Statistics. 5th.ed. San Francisco: Dellen, 1991.
Lua MLA (9ú heag.)McClave, James T., agus Frank H. Dietrich. Statistics. 5th.ed. Dellen, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.