Hilty. Dirt, Sweat, and Diesel. University of Missouri Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHilty. Dirt, Sweat, and Diesel. University of Missouri Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHilty. Dirt, Sweat, and Diesel. University of Missouri Press.
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