Greenland, David
Charles E. Merrill, 1983
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Artikel Jurnal
Mike Millmore, Philip Lewis, Mark Saunders, Adrian Thornhill, Trevor Morrow
Prentice-Hall, 2007
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Stone, Raymond J.
John Wiley & Sons, 1995
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by John H. Hollenbeck [and others]
McGraw-Hill, 2009
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