Race, gender, and opportunity: A study of compensation attainment and the establishment of mentoring relationships.
Dreher, George F.;Cox Jr., Taylor H.
Journal of Applied Psychology, Vol 81(3), Jun 1996, 297-308. doi: 10.1037/0021-9010.81.3.297
http://psycnet.apa.org/journals/apl/81/3/297/