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Cambridge University Press , 1991
Buku Teks
Kent, Martin, author
Belhaven Press, 1992
Buku Teks
edited by J. Rozema and J.A.C. Verkleij
Kluwer Academic , 1991
Buku Teks
Weaver, John E., author
McGraw-Hill, 1938
Buku Teks
Southwick, Charles H., author
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Buku Teks