Evans V. Virginia & Obee B. Bob. (2020). Upstream. B2+: Workbook (7th ed.). Newbury, Express Publishing, 2020.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEvans V. Virginia और Obee B. Bob. Upstream. B2+: Workbook. 7th ed. Newbury, Express Publishing, 2020, 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEvans V. Virginia और Obee B. Bob. Upstream. B2+: Workbook. 7th ed. Newbury, Express Publishing, 2020, 2020.
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