1. US Business Cycle Expansions and Contractions (2013). National Bureau of Economic Research. http://www.nber.org/cycles.html#announcements .
2. Garr, E. (2011). The landscape of recession: Unemployment and safety net services across Urban and Surburban America. The Brookings Institution. http://www.brookings.edu/~/media/research/files/papers/2011/3/31%20recession%20garr/0331_recession_garr.pdf .
3. Bocian, D., Li, W., & Reid, C. (2011). Lost Ground, 2011: Disparities in mortgage lending and foreclosures. Center for Responsible Lending. http://www.responsiblelending.org/mortgage-lending/research-analysis/Lost-Ground-2011.pdf .
4. Berger, L. M. (2004). Income, family structure, and child maltreatment risk. Children and Youth Services Review, 26(8), 725–748.
5. Cancian, M., Slack, K.S., & Yang, M.Y. (2010). The effect of family income on risk of child maltreatment. Institute for Research on Poverty. http://www.irp.wisc.edu/publications/dps/pdfs/dp138510.pdf .