9. References

IBM 2016, IBM Knowledge Center: SPSS Statistics, IBM, viewed 18 May 2016, <https://www.ibm.com/support/knowledgecenter/SSLVMB/welcome/>.

 

van den Berg RG 2013, 8.1.1 SPSS Syntax – Six reasons you should use it, SPSS Tutorials, viewed 17 May 2016, <http://www.spss-tutorials.com/spss-syntax-six-reasons-you-should-use-it/>.  

 

van den Berg RG 2015, 1.2.1 SPSS Combining data with syntax and output, SPSS Tutorials, viewed 17 May 2016, < http://www.spss-tutorials.com/spss-combining-data-with-syntax-and-output/>.  

 

van den Berg RG 2016, SPSS Tutorials, viewed 17 May 2016, <http://www.spss-tutorials.com/>.