Freund, J. E. (1981). Statistics: A first course (2nd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Freund, John E. Statistics: A First Course. 2nd ed. Englewood Cliffs, NJ : New Jersey: Prentice Hall, 1981.
Lua MLA (9ú heag.)Freund, John E. Statistics: A First Course. 2nd ed. Prentice Hall, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.