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Buku Referensi
edited by Thom Brooks
Blackwell, 2008
Buku Teks
Buscemi, Santi V., author
McGraw-Hill , 2002
Buku Teks
Rottenberg, Annette T.
St. Martin, 1988
Buku Teks
Muller, Gilbert H., author
McGraw-Hill, 1982
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