1. Nursing research: methods, critical appraisal and utilisation;Beanland,1999
2. Q. How many options should a multiple choice question have? (a) 2, (b) 3, (c) 4;Catts,1978
3. Applied multiple regression/correlation analysis for the behavioural sciences;Cohen,1983
4. Essentials of psychological testing;Cronbach,1990
5. Statistics for the behavioral sciences;Gravetter,2000