http://www.opb.org/news/article/psu-study-african-americans-remain-at-disadvantage/
http://www.rcgd.isr.umich.edu/prba/perspectives/spring1995/cherring.pdf
http://researchnews.osu.edu/archive/blckcost.htm
http://nulwb.stage.iamempowered.com/sites/nulwb.iamempowered.com/files/Article%208%20%28Rev%20of%20Blk%20Pol%20Econ%20%2710%29.pdf
http://news.uchicago.edu/article/2014/02/15/aaas-2014-longer-commutes-disadvantage-african-american-workers

