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Prentice-Hall, 2002
Buku Teks
edited by, Elise C. Smith and Louise Fiber Luce
Nuwbury House Publishers, 1979
Buku Teks
Tan, Joo Seng, author
McGrawHill, 2004
Buku Teks
Nieuwenhuijze, C. A. O. van
The Hague, 1972
Buku Teks
Tan, Joo Seng, author
McGraw-Hill , 2004
Buku Teks