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Majalah, Jurnal, Buletin
Samarjit Chakraborty, Jorg Eberspacher, editors
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eBooks
Blackman, Maurice, author
John Wiley & Sons, 1975
Buku Teks
Bennett, Stuart, author
Prentice-Hall, 1994
Buku Teks
Halang, Wolfgang A., author
Kluwer Academic Publishers, 1991
Buku Teks