by William Ritchie, Michael Wood, Robert Wright; David Tait
John Wiley & Sons, 1987
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Royer, King
John Wiley & Sons, 1970
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McCormac, Jack C., author
Prentice-Hall, 1995
Buku Teks
Evett, Jack B., 1942-, author
Prentice-Hall, 1991
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Searles, William H., author
John Wiley & Sons, 1949
Buku Referensi