How does ethnic identity contribute to a person's self esteem
I would look at Jennifer Crocker and Brenda Major's paper in 1989, Psychological Review, entitled "Social Stigma and Self-Esteem: The Self-Protective Properties of Stigma" which focuses on how being the target of social stigma can actually be protective of one's self-esteem.  It's not precisely what you're discussing but it comes the closest in the literature I know and they're discussion and bibliography would likely be a good starting point.  Hope this helps!