Rajapakse, Ruwan
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Poulos, H.G.,
John Wiley & Sons, 1980
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Tomlinson, M. J. (Michael John), author
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Buku Referensi
Poulos, H.G., author
Wiley, 1980
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Munson, Albe E., author
McGraw-Hill, 1974
Buku Teks