Eisenberg, N. (2000). Empathy and sympathy. In M. Lewis & J. M. Haviland-Jones (Eds.), Handbook of emotions (2nd ed.) (pp. 677-691). New York, NY: Guilford Press.
Goleman, D. (2006). Social intelligence: The new science of human relationships. New York, NY: Bantam Dell.
Hoffman, M. L. (2001). Empathy and moral development: Implications for caring and justice. Cambridge, UK: Cambridge University Press.
Kaplan, L.J. (1978). Oneness and separateness: From infant to individual. New York, NY: Simon & Schuster.