Pinto, C. J. (2005). Riddles in stone: The secret architecture of Washington D.C. Antiquities Research Films.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPinto, Christian J. Riddles in Stone: The Secret Architecture of Washington D.C. [United States?]: Antiquities Research Films, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPinto, Christian J. Riddles in Stone: The Secret Architecture of Washington D.C. Antiquities Research Films, 2005.
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