Johnson, R. (1996). Elementary statistics (7th ed.). Duxbury.
Lua i Stíl Chicago (17ú heag.)Johnson, Robert. Elementary Statistics. 7th ed. Belmont: Duxbury, 1996.
Lua MLA (9ú heag.)Johnson, Robert. Elementary Statistics. 7th ed. Duxbury, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.