Não informado. (1969). Elements. University of Alberta, Department of Elementary Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Elements. Alberta, Canada: University of Alberta, Department of Elementary Education, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Elements. University of Alberta, Department of Elementary Education, 1969.
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