Não informado. (1947). Contributions from Bears Bluff Laboratories. Bears Bluff Laboratories.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Contributions from Bears Bluff Laboratories. Wadmalaw Island, SC: Bears Bluff Laboratories, 1947.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Contributions from Bears Bluff Laboratories. Bears Bluff Laboratories, 1947.
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