edited by W.A. Paton
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William J. Hardcastle, John Laver, Fiona E. Gibbon, editor
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Buku Teks SO
Thampan, Palakasseril Kumaran
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Buku Referensi
Prentice-Hall, 1991
Buku Referensi
Frederick S. Merritt and Jonathan T. Ricketts, editor
McGraw-Hill, Inc, 1994
Buku Referensi