Leppert, S. (2009). The Horizontal on the Vertical: Carl Alexander Park in Baesweiler near the German city of Aachen will be an engine for urban design development. Topos.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLeppert, Stefan. "The Horizontal on the Vertical: Carl Alexander Park in Baesweiler Near the German City of Aachen Will Be an Engine for Urban Design Development." Topos 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLeppert, Stefan. "The Horizontal on the Vertical: Carl Alexander Park in Baesweiler Near the German City of Aachen Will Be an Engine for Urban Design Development." Topos, 2009.
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