Evans V. Virginia & Dooley J. Jenny. (2002). Upstream. Intermediate plus: Workbook. Student's Book. Newbury, Express Publishing, 2002.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEvans V. Virginia और Dooley J. Jenny. Upstream. Intermediate Plus: Workbook. Student's Book. Newbury, Express Publishing, 2002, 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEvans V. Virginia और Dooley J. Jenny. Upstream. Intermediate Plus: Workbook. Student's Book. Newbury, Express Publishing, 2002, 2002.
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