1. The psychology of happiness;Argyle,1987
2. Wisconsin Card Sort Test;Berg,1980
3. The three basic factor-analytic designs—Their interrelations and derivatives;Cattell;Psychological Bulletin,1952
4. Vitality, energy, spirit: A Taoist source book;Cleary,1991
5. Personal causation: The internal affective determinants of behavior;deCharms,1968