Washington State Research Council. The Book of numbers. Washington State Research Council.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington State Research Council. The Book of Numbers. Olympia, Wash.: Washington State Research Council.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington State Research Council. The Book of Numbers. Washington State Research Council.
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