Cita APA (7th ed.)
Johnson, R. (1992). Elementary statistics (6th ed.). Duxbury.
Cita Chicago (17th ed.)
Johnson, Robert. Elementary Statistics. 6th ed. Belmont: Duxbury, 1992.
Cita MLA (9th ed.)
Johnson, Robert. Elementary Statistics. 6th ed. Duxbury, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.