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Intelligence
B. Delvin, Michael Daniels and Kathryn Roeder (1997). `The heritability of IQ'. Nature, 388.
Personality
R. F. Krueger and W. Johnson (2008). `Behavioral genetics and personality: A new look at the integration of nature and nurture'. Handbook of personality: Theory and research, pages 287-310.
Happiness
S. Lyubomirsky, K. M. Sheldon and D. Schkade (2005). `Pursuing Happiness: The Architecture of Sustainable Change'. Review of General Psychology, 9.