Não informado. (1969). Eric news. Eric Clearinghouse on Teacher Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Eric News. Washington: Eric Clearinghouse on Teacher Education, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Eric News. Eric Clearinghouse on Teacher Education, 1969.
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