Meade, Richard A.
Effective English: workbook 3 and 4
Belmont, 1964
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A creative partnership and an innovative and effective multimedia english language learning and teaching website
Artikel Jurnal
Drucker, Peter Ferdinand, 1909-2005
The effective executive
Harper & Row, 1996
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Brown, Milon
Effective supervision
Macmillan, 1956
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Ficker, Victor B.
Effective supervision
Charles E. Merrill, 1975
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