Williams, O. P. (1965). Suburban differences and metropolitan policies: A Philadelphia story. University of Pennsylvania Press.
Lua i Stíl Chicago (17ú heag.)Williams, Oliver P. Suburban Differences and Metropolitan Policies: A Philadelphia Story. Philadelphia: University of Pennsylvania Press, 1965.
Lua MLA (9ú heag.)Williams, Oliver P. Suburban Differences and Metropolitan Policies: A Philadelphia Story. University of Pennsylvania Press, 1965.
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