Wilson, John A.R.
McGraw-Hill, 1974
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Sukarni Catur Utami Munandar
Departemen Pendidikan dan Kebudayaan, [Date of publication not identified]
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Laura, Ronald S.
Falmer Press, 1999
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Adams, Georgia Sachs
Holt, Rinehart and Winston, 1965
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editor, Dirk Ifenthaler, Deniz Eseryel, Xun Ge
Springer, 2012
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