(1997). The Business Environment: Challenges And Changes / Ian Brooks. Prentice-Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThe Business Environment: Challenges And Changes / Ian Brooks. Prentice-Hall, 1997.
एमएलए (8वां संस्करण) प्रशस्ति पत्रThe Business Environment: Challenges And Changes / Ian Brooks. Prentice-Hall, 1997.
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