Shelley, Joseph F.
McGraw-Hill, 1980
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Hibbeler, R.C.
Pearson/Prentice Hall, 2006
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Hibbeler, R.C.
Prentice-Hall, 2004
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Gray, Gary L
McGraw-Hill, 2010
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Meriam, James L.
John Wiley & Sons, 1976
Buku Referensi