Lenssen-Erz, T. The dark ages of picturing: Does art originate from caves? A synopsis / Tilman Lenssen-Erz. Origins of pictures : anthropological discourses in image science.(2013).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLenssen-Erz, Tilman. "The Dark Ages of Picturing: Does Art Originate from Caves? A Synopsis / Tilman Lenssen-Erz." Origins of Pictures : Anthropological Discourses in Image Science.(2013) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रLenssen-Erz, Tilman. "The Dark Ages of Picturing: Does Art Originate from Caves? A Synopsis / Tilman Lenssen-Erz." Origins of Pictures : Anthropological Discourses in Image Science.(2013), .
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