Keil, R., & Ronneberger, K. The globalization of Frankfurt am Main: Core, periphery and social conflict / Roger Keil. Klaus Ronneberger. Globalizing cities : a new spatial order?.(2000).
Lua i Stíl Chicago (17ú heag.)Keil, Roger, agus Klaus Ronneberger. "The Globalization of Frankfurt Am Main: Core, Periphery and Social Conflict / Roger Keil. Klaus Ronneberger." Globalizing Cities : A New Spatial Order?.(2000) .
Lua MLA (8ú heag.)Keil, Roger, agus Klaus Ronneberger. "The Globalization of Frankfurt Am Main: Core, Periphery and Social Conflict / Roger Keil. Klaus Ronneberger." Globalizing Cities : A New Spatial Order?.(2000), .
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