Hershberg, T. (1979). A Tale of three cities: Blacks and immigrants in Philadelphia, 1850-1880, 1930 and 1970. Philadelphia, PA: Center for Philadelphia Studies, School of Public and Urban Policy, University of Pennsylvania.

Hershberg, Theodore. A Tale of Three Cities: Blacks and Immigrants in Philadelphia, 1850-1880, 1930 and 1970. Philadelphia, PA: Center for Philadelphia Studies, School of Public and Urban Policy, University of Pennsylvania, 1979.

Hershberg, Theodore. A Tale of Three Cities: Blacks and Immigrants in Philadelphia, 1850-1880, 1930 and 1970. Philadelphia, PA: Center for Philadelphia Studies, School of Public and Urban Policy, University of Pennsylvania, 1979.