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2. Alternative ways of assessing model fit;Browne,1992
3. Structural Equation Modeling with EQS: Basic Concepts, Applications and Programming;Byrne,2006
4. Competence, autonomy, and relatedness: a motivational analysis of self-system processes;Connell,1991
5. Intrinsic Motivation and Self-Determination in Human Behavior;Deci,1985