1.
雑誌 |
Akademie der Pädagogischen Wissenschaften der D.D.R
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2.
雑誌 |
British Institute of Adult Education ; National Institute of Adult Education ; National Institute of Adult Continuing Education
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3.
雑誌 |
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4.
雑誌 |
Teachers College, Columbia University
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5.
雑誌 |
Harvard University. Graduate School of Education
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