Barrick, M. R., & Mount, M. K. 1991 The Big Five personality dimensions and job performance: A meta-analysis. Personnel Psychology, 44, 1-26.
Digman, J. M., & Takemoto-Chock, N. K. 1981 Factors in the natural language of personality: Reanalysis, comparison and interpretation of six major studies. Multivariate Behavioral Research, 16, 149-170.
Eysenck, H. J. 1992 Four ways five factors are not basic. Journal of Personality and Individual Defferences, 13, 667-673.