Berkman, E. T. (2012). A Conceptual Guide to Statistics Using SPSS. Sage.
Cita Chicago (17th ed.)Berkman, Elliot T. A Conceptual Guide to Statistics Using SPSS. London: Sage, 2012.
Cita MLA (9th ed.)Berkman, Elliot T. A Conceptual Guide to Statistics Using SPSS. Sage, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.