Genetic and Environmental Influences on the Positive Traits of the Values in Action Classification, and Biometric Covariance with Normal PersonalitySteger, M. F., Hicks, B. M., Kashdan, T. B., Krueger, R. F., & Bouchard, T. J., Jr. (2007). Genetic and environmental influences on the positive traits of the values in action classification, and biometric covariance with normal personality. Journal of Research in Personality, 41(3), 524–539. https://doi.org/10.1016/j.jrp.2006.06.002