Quible, Zone K.
Prentice Hall International,inc, 1996
Buku Teks
Ewald, Helen Rothschild
Prentice-Hall International, 1997
Buku Teks
Krizan, A.C.
Thomson, 2008
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Prentice-Hall International, 1997
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Moll, Melanie
[Springer, ], 2012
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