Barraclough, C. (2008). Activate! B1+: Workbook. Pearson Education limited: England.
शिकागो स्टाइल उद्धरणBarraclough, Carolyn. Activate! B1+: Workbook. Pearson Education limited: England, 2008.
एमएलए उद्धरणBarraclough, Carolyn. Activate! B1+: Workbook. Pearson Education limited: England, 2008.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.