Argumentative essay on the disparities of sentencing of races in

I need a research paper where at least 7 official sources, government cites are to cited where it arguments the disparities of the court imposed sentences to marijuana cases based on their race.  No news or blog citing are allowed.  The paper must be MLA format and at least 6 pages.  My view is that there is a disparities and minorities and blacks are sentenced higher that white people.  Must be well written and no plagiarism.