1. Diagnostic and Statistical Manual of Mental Disorder;American Psychiatric Association,1980
2. Diagnostic and Statistical Manual of Mental Disorder;American Psychiatric Association,1987
3. Diagnostic and Statistical Manual of Mental Disorder;American Psychiatric Association,1994
4. Comparative fit indexes in structural models;Bentler;Psychol. Bull.,1990
5. Some latent trait models;Birnbaum,1968