PENN, M. R. (2012). Introduction to Infrastructure: An introduction to civil and environmental engineering / Michael R. Penn, Philip J. Parker. John Wiley.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPENN, Michael R. Introduction to Infrastructure: An Introduction to Civil and Environmental Engineering / Michael R. Penn, Philip J. Parker. John Wiley, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPENN, Michael R. Introduction to Infrastructure: An Introduction to Civil and Environmental Engineering / Michael R. Penn, Philip J. Parker. John Wiley, 2012.
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