Levine, G. (1991). A Guide to SPSS for analysis of variance. Lawrence Erlbaum Associates.
Cita Chicago (17th ed.)Levine, Gustav. A Guide to SPSS for Analysis of Variance. New Jersey: Lawrence Erlbaum Associates, 1991.
Cita MLA (9th ed.)Levine, Gustav. A Guide to SPSS for Analysis of Variance. Lawrence Erlbaum Associates, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.