APA (7th ed.) Zitazioa
Johnson, R. (1992). Elementary statistics (6th ed.). Duxbury.
Chicago Style (17th ed.) Zitazioa
Johnson, Robert. Elementary Statistics. 6th ed. Belmont: Duxbury, 1992.
MLA (9th ed.) Zitazioa
Johnson, Robert. Elementary Statistics. 6th ed. Duxbury, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.