Umaskini
Danziger, Sheldon H., and Daniel H. Weinberg "The Historical Record: Trends in Family Income, Inequality, and Poverty."  Kurasa za. 18-50 katika Confronting Poverty: Prescriptions for Change  ilihaririwa na Sheldon H. Danziger, Gary D. Sandefur, na Daniel.  H. Weinberg. Russell Sage Foundation. 1994.