Borsboom, D., Mellenbergh, G. J. & Van Heerden, J. (2003). The theoretical status of latent variables. *Psychological Review, 110,* 203-219.

Braun, V. & Clarke, V. (2006). Using thematic analysis in psychology. *Qualitative Research in Psychology, 3, *77-101.

Caprara, G.V., Barabaranelli, C., Bermudez, J., Maslach, C., & Ruch, W. (2000). Multivariate methods for the comparison of factor structures in cross-cultural research. *Journal of Cross-Cultural Psychology, 31*, 437-464.

Glorfeld, L. W. (1995). An improvement on Horn’s parallel analysis methodology for selecting the correct number of factors to retain. *Educational and Psychological Measurement, 55,* 377-393.

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Hogarty, K. Y. & Kromrey, J. D. (2000). *Robust effect size estimates and meta-analytic tests of homogeneity*. Poster presented at 25^{th} International Conference for SAS Users. Retrieved October 27, 2009, from: http://www2.sas.com/proceedings/sugi25/25/po/25p217.pdf

Horn, J. L. (1965). A rationale and test for the number of factors in factor analysis. *Psychometrika, 30, *179-185.

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**Descriptive statistics**

http://www.socialresearchmethods.net/kb/statdesc.php

http://www.le.ac.uk/bl/gat/virtualfc/Stats/descrip.html

http://davidmlane.com/hyperstat/A28521.html

**The mean, median and mode**

http://www.cimt.plymouth.ac.uk/projects/mepres/book8/bk8i5/bk8_5i2.htm

**Inferential statistics**

http://www.socialresearchmethods.net/kb/statinf.php

http://hsc.uwe.ac.uk/dataanalysis/quantInf.asp

http://www.sdecnet.com/psychology/stathelp.htm

http://owl.english.purdue.edu/owl/resource/672/05/

http://www.sfu.ca/~richards/Zen/show9/ch9.html

**Population, sampling and other related concepts**

http://www.stats.gla.ac.uk/steps/glossary/basic_definitions.html#popn

http://www.soc.surrey.ac.uk/samp/index.html

http://www.stats.gla.ac.uk/steps/glossary/sampling.html#randsamp

http://www.custominsight.com/articles/random-sampling.asp