Não informado. (1969). International Journal of Early Childhood. World Organization for Early Childwood Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. International Journal of Early Childhood. Dublin: World Organization for Early Childwood Education, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. International Journal of Early Childhood. World Organization for Early Childwood Education, 1969.
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