Allen, Edward D.
Harcourt Brace Jovanovich, [Date of publication not identified]
Buku Teks
Etzel, Michael J.
McGraw-Hill/Irwin, 2007
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Pearson Education, Prentice Hall, 2008
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Cateora, Philip R.
2005
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Adler, Ronald B. (Ronald Brian), 1946-
2002
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