BookDooley, D.D. (2001). Social Research Methods (4th ed.). New Jersey: Prentice Hall |
 |
BookSpector, P.E. (1991). Summated rating scale construction. Thousand Oaks: Sage publications inc. |
 |
BookStats: Data and Models (2012) Third Edition (International Edition), R.D. De Veaux, P.F. Velleman, D.E. Bock, Pearson. ISBN: 9781292022451 |
 |
BookHuizingh, E. (2014). Inleiding SPSS 22, ISBN 9789039528006 Only for Dutch speaking students. |
 |
BookA visual approach to SPSS for windows: a guide to SPSS statistics Stern, L.D., , Pearson Education, (ISBN 9781292022574). Only for non-Dutch speaking students |
 |
Articles |