Vierck, Robert K., author
International Textbook, 1967
Buku Teks
McConnell, Kenneth G., author
John Wiley & Sons, 2008
Buku Teks
Jackson, Charles, author
Gulf Pub. Co., Book Division, 1979
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Thomson, William Tyrrell, author
Prentice-Hall, 1979
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Thomson, William Tyrrell, author
Prentice-Hall, 1982
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