Smith, R. M. (1969). Teacher dignosis of educational difficulties. Charles E.Merrill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSmith, Robert M. Teacher Dignosis of Educational Difficulties. Columbus: Charles E.Merrill, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSmith, Robert M. Teacher Dignosis of Educational Difficulties. Charles E.Merrill, 1969.
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