Educational Testing Service. ETS research report series. Educational Testing Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEducational Testing Service. ETS Research Report Series. Princeton, N.J.: Educational Testing Service.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEducational Testing Service. ETS Research Report Series. Educational Testing Service.
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