Indonesia media guide : stand up or get wasted
PPPI, 2010
 Buku Referensi
Smith, J. W., author
The world's wasted wealth : the political economy of waste
New Worlds Express , 1989
 Buku Teks
Kennedy, Barry W., author
Energy efficient transformers
McGraw-Hill, 1998
 Buku Teks
Lloyd, Lewis E., author
Techniques for efficient research
Chemical Publishing Company, Inc., 1966
 Buku Teks
Bentley, Jon Louis, author
Writing efficient programs
Prentice-Hall, 1982
 Buku Teks
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