Hutchinson, T. (1997). Life Lines: Pre-Intermediate student's book (1a. ed. 9. reimp.). OffordUniversity Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHutchinson, Tom. Life Lines: Pre-Intermediate Student's Book. 1a. ed. 9. reimp. Estados Unidos: OffordUniversity Press, 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHutchinson, Tom. Life Lines: Pre-Intermediate Student's Book. 1a. ed. 9. reimp. OffordUniversity Press, 1997.
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