5Coan,R.W.Measurable components of openness to experience. Journal of Consulting and Clinical Psychology, 1972, 39(2): 346.
6Coan, R. W. The optimal personality: An empirical and theoretical analysis. Columbia University Press, 1974.
7Costa, P. T. & McCrae, R. R. Objective personality assessment. Springer US, 1978.
8De Young, C. G, Peterson, J. B., & Higgins, D. M. Higher-order factors of the Big Five predict conformity: Are there neuroses of health? Personality and Individual Differences, 2002, 33:533-552.
9De Young, C. G, Peterson, J. B., & Higgins, D. M. Sources of openness/intellect: Cognitive and neuropsychological correlates of the fifth factor of personality. Journal of Personality, 2005, 73(4): 825-858.