Levin, J. R. (1977). Learner differences: Diagnosis and prescription. Holt, Rinehart and Winston.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLevin, Joel R. Learner Differences: Diagnosis and Prescription. New York: Holt, Rinehart and Winston, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLevin, Joel R. Learner Differences: Diagnosis and Prescription. Holt, Rinehart and Winston, 1977.
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