Iscuss childrenas moral reasoning about gender and race-based peer exclusion

Please be advise that this essay is a Master level and should be critical paper.
I will provide you with some references but you need to add more.
Please do use this reference book as well.
Siegler,R.S.,DeLoache,J.,&Eisenberg,N.(2010).How children develop (3rd ed).New york:worth.chapter 14 ,Moral development .