Easterly, William Russell
The white man's burden : why the West?s efforts to aid the rest have done so much ill and so little good
The Penguin Press, 2006
 Buku Teks
Richards, Larry E.
Business statistics : why and when
McGraw-Hill , 1983
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Why don't families have more babies?
 Artikel Jurnal
Successful small business management
by Curtis E. Tate Jr. ... [and others]
Business Publication, 1982
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Dersal, William R. Van
The Successful supervisor in government and business
Harper & Brother, 1962
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