Não informado. (1974). History and social science teacher. Ontario History and Social Science Teachers Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. History and Social Science Teacher. Toronto, Canada: Ontario History and Social Science Teachers Association, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. History and Social Science Teacher. Ontario History and Social Science Teachers Association, 1974.
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