300178 Wallace, I. N. D. (1970). Building and civil engineering standard forms: First supplement. London : Sweet & Maxwell.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र300178 Wallace, Ian Norman Duncan. Building and Civil Engineering Standard Forms: First Supplement. London : Sweet & Maxwell, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्र300178 Wallace, Ian Norman Duncan. Building and Civil Engineering Standard Forms: First Supplement. London : Sweet & Maxwell, 1970.
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