Ricketts, Erol; Isabel Sawhill (1988). "Defining and Measuring the Underclass". Journal of Policy Analysis and Management. 2. 7 (2): 316–325. doi:10.2307/3323831. JSTOR3323831.
Wilson, William Julius (1991). "Studying Inner-City Social Dislocations: The Challenge of Public Agenda Research: 1990 Presidential Address". American Sociological Review. 56 (1): 1–14. doi:10.2307/2095669. JSTOR2095669.
Ricketts, Erol; Isabel Sawhill (1988). "Defining and Measuring the Underclass". Journal of Policy Analysis and Management. 2. 7 (2): 316–325. doi:10.2307/3323831. JSTOR3323831.
Wilson, William Julius (1991). "Studying Inner-City Social Dislocations: The Challenge of Public Agenda Research: 1990 Presidential Address". American Sociological Review. 56 (1): 1–14. doi:10.2307/2095669. JSTOR2095669.