Educational Testing Service. (2007). The official guide to the new toefl ibt. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEducational Testing Service. The Official Guide to the New Toefl Ibt. New York: McGraw-Hill, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEducational Testing Service. The Official Guide to the New Toefl Ibt. McGraw-Hill, 2007.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.