Social status
Mcpherson, M., Smith-Lovin, L., & Cook, J. M. BIRDS OF A FEATHER. American Journal of Sociology, 27, Retrieved Sept 27, 2007, from http://www.library.ohiou.edu:5334/ehost/detail?vid=7&hid=109&sid=c920800d-7008-402f-a473-219b2545f452%40sessionmgr102.