Relating to Rock Art in the Contemporary World. University Press of Colorado.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRelating to Rock Art in the Contemporary World. University Press of Colorado.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRelating to Rock Art in the Contemporary World. University Press of Colorado.
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