1. Ordinal methodology in the analysis of likert scales;Göb;Quality Quantity,2007
2. Handbook of Research Design and Social Measurement;Miller,2002
3. Rating Scales and Checklists: Evaluating Behavior, Personality, and Attitudes;Aiken,1996
4. A comparison of world-wide web and paper-and-pencil personality questionnaires, Behavior Research Methods;Pettit;Instrum. Comp.,2002
5. Psychological Testing: An Introduction;Domino,2006