Montgomery, D. R. (2007). Dirt: The erosion of civilizations. University of California Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMontgomery, David R. Dirt: The Erosion of Civilizations. Berkeley: University of California Press, 2007.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMontgomery, David R. Dirt: The Erosion of Civilizations. University of California Press, 2007.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.