Hoel, P. G. (1971). Elementary statistics (3rd ed.). Wiley.
Lua i Stíl Chicago (17ú heag.)Hoel, Paul Gerhard. Elementary Statistics. 3rd ed. New York: Wiley, 1971.
Lua MLA (8ú heag.)Hoel, Paul Gerhard. Elementary Statistics. 3rd ed. Wiley, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.