Não informado. (1968). Contemporary education. Indiana University, School of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Contemporary Education. Terre Haute, Ind: Indiana University, School of Education, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Contemporary Education. Indiana University, School of Education, 1968.
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