Kontroller pensum med emneansvarlig f?r innkj?p, siden det kan bli endringer.
Robert F. DeVillis (2003) Scale Development. Theory and applications. 2nd edition, Applied Social Research methods Series, Vol 26, Sage Publications. (176 sider).
Dennis Howitt og Duncan Cramer (2005). Introduction to Statistics in Psychology. 3rd edition. Prentice Hall. Chapter 8, 26, 27, 28 (50 sider)
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