Qasim, Syed R.
Prentice-Hall, 2000
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Qasim, Syed R.
Holt, Rinehart, and Winston, 1985.
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McGraw-Hill, 1997
Buku Teks
essay by Dave Hickey, Peter Plagens
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Buku Referensi
edited by Charles ReVelle, Arthur E. McGrarity
John Wiley & Sons, 1997
Buku Teks