Where to find scientific studys for sociology issues?

Question

for my multicultural issues class I have to find, bring and read a current scientific study dealing iwht the biological vs. social constructio of race, antoher of racial discrimination in the U.S. and another on ethnic cleansing/holocaust.

The professor wants a study found online but I don't know were to start looking for any studies on these topics. Does anyone have any ideas for me.

Best site will get best answer.

Answer 1

Wikipedia