Crawford, J. T., S. A. Modri, and M. Motyl. “Bleeding-Heart Liberals and Hard-Hearted Conservatives: Subtle Political Dehumanization Through Differential Attributions of Human Nature and Human Uniqueness Traits”. Journal of Social and Political Psychology, Vol. 1, no. 1, Oct. 2013, p. Article e4737, doi:10.5964/jspp.v1i1.184.