Westerman. Working on Earth. University of Nevada Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWesterman. Working on Earth. University of Nevada Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWesterman. Working on Earth. University of Nevada Press.
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