1. The Nature of Foster Care: International Trends;Colton;Adoption & Fostering,1997
2. Foster Care beyond the Crossroads: Lessons from an International Comparative Analysis;George;Childhood,2003
3. Understanding the Challenges of the US Foster Care System: Lessons Learned from Agency Practitioners and Court Officials;Houston;European Journal of Social Sciences,2010
4. Roby , Jini L. 2011 “Children in Informal Alternative Care” http://www.unicef.org/protection/Informal_care_discussion_paper_final.pdf