Levin, J., & Fox, J. A. (2003). Elementary statistics in social research. Boston, Mass : Allyn & Bacon.
Cita Chicago (17th ed.)Levin, Jack, i James Alan Fox. Elementary Statistics in Social Research. Boston, Mass : Allyn & Bacon, 2003.
Cita MLA (9th ed.)Levin, Jack, i James Alan Fox. Elementary Statistics in Social Research. Boston, Mass : Allyn & Bacon, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.