1. Learned helplessness in humans: Critique and reformulation;Abramson;Journal of Abnormal Psychology,1978
2. EQS: Structural equation program manual;Bentler,1993
3. The robustness of LISREL against small sample sizes in factor analysis models;Boomsma,1982
4. Motivation and gambling involvement;Chantal;Journal of Social Psychology,1995
5. Intrinsic motivation;Deci,1975