1. A new incremental fit index for general structural equation models;Bollen;Sociological Methods of Research,1989
2. The scientific rationale for comprehensive, community-based, smoking control strategies;Burns,1991
3. Statistical power analysis for the behavioral sciences;Cohen,1977
4. Coefficient alpha and the internal structure of tests;Cronbach;Psychometrika,1951
5. Approaches directed to the social environment;Cummings,1991