Educational Testing Services. (2012). The official guide to the TOEFL test (4th ed.). McGraw-Hill ; Tata McGraw Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEducational Testing Services. The Official Guide to the TOEFL Test. 4th ed. New York : New Delhi: McGraw-Hill ; Tata McGraw Hill, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEducational Testing Services. The Official Guide to the TOEFL Test. 4th ed. McGraw-Hill ; Tata McGraw Hill, 2012.
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