Worcester, A. (2006). Building skills for the TOEFL iBT: Beginning. Tp.Hồ Chí Minh: Trẻ.
शिकागो स्टाइल उद्धरणWorcester, Adam. Building Skills for the TOEFL IBT: Beginning. Tp.Hồ Chí Minh: Trẻ, 2006.
एमएलए उद्धरणWorcester, Adam. Building Skills for the TOEFL IBT: Beginning. Tp.Hồ Chí Minh: Trẻ, 2006.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.