RICHARDS, P. (1992). Law Of Contract Paul Richards. Pitman Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRICHARDS, Paul. Law Of Contract Paul Richards. Pitman Publishing, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRICHARDS, Paul. Law Of Contract Paul Richards. Pitman Publishing, 1992.
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