Jakeman V. Vanessa & Whitehead R. Russell. (2002). BEC. Preliminary Practice Tests. Lower intermediate with answers: Four tests for the Cambridge Business English Certificate. Oxford, Oxford University Press, 2002.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJakeman V. Vanessa और Whitehead R. Russell. BEC. Preliminary Practice Tests. Lower Intermediate with Answers: Four Tests for the Cambridge Business English Certificate. Oxford, Oxford University Press, 2002, 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJakeman V. Vanessa और Whitehead R. Russell. BEC. Preliminary Practice Tests. Lower Intermediate with Answers: Four Tests for the Cambridge Business English Certificate. Oxford, Oxford University Press, 2002, 2002.
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