| 1 | Gravetter, F.J. and Wallnau, L.B. (2012). Statistics for the Behavioral Sciences. 9th edition. Wadsworth, USA. |
| 2 | Pallant, J. (2011). SPSS Survival Manual: A Step by Step Guide to data Analysis using SPSS, 4th edition. Open University Press, USA |
| 3 | Akdeniz, F. 1998; Olasılık ve İstatistik, Baki Kitabevi, Adana. |