Uris, Auren
The efficient executive
McGraw-Hill , 1957
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Becker, Selwyn W. (Selwyn William), 1929-
The efficient organization
Elsevier, 1975
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Efficient reading
Artikel Jurnal
Effective vs efficient computing
Prentice-Hall, 1973
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Kennedy, Barry W.
Energy efficient transformers
McGraw-Hill, 1998
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