1. Optimism and self-mastery predict more rapid disengagement from unsolvable tasks in the presence of alternatives;Aspinwall;Motivation & Emotion,1999
2. Great expectations: Optimism and pessimism in achievement settings;Brown,2001
3. Optimism;Carver;Clinical Psychology Review,2010
4. Pretest-posttest designs and measurement of change;Dimitrov;Work: Journal Of Prevention, Assessment & Rehabilitation,2003
5. Ten difference score myths;Edwards;Organizational Research Methods,2001