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    Published 1997
    Book
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    by Fukutake, Tadashi
    Published 1991
    Book
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  8. 8
    by Hooja, Rakesh
    Published 1987
    Book
  9. 9
    Published 1986
    Book
  10. 10
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  14. 14
    by Ortigas, Irene L.
    Published 1978
    Book
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  18. 18
    Published 1967
    Book
  19. 19
    by Beardsley, Richard King 1918-
    Published 1959
    Book
  20. 20
    Published in Education Quarterly (1954)
    Article