APA (7 वां संस्करण) प्रशस्ति पत्र
Norbury, D. (2010). Soil and rock description in engineering practice. Whittles Pub. ; CRC Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Norbury, David. Soil and Rock Description in Engineering Practice. Dunbeath, Scotland : Boca Raton, Fla.: Whittles Pub. ; CRC Press, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Norbury, David. Soil and Rock Description in Engineering Practice. Whittles Pub. ; CRC Press, 2010.
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