Johnson, C. (2002). Pre-Intermediate Business English: Test file. Pearson Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Christine. Pre-Intermediate Business English: Test File. Essex: Pearson Education, 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJohnson, Christine. Pre-Intermediate Business English: Test File. Pearson Education, 2002.
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