Lanier, Susan, author
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Bowman, J.H.
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Buku Referensi
edited by Michael Gorman, Paul W. Winkler
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Buku Referensi
Kochar, R.S., author
Rajat Publications, 1998
Buku Teks
Raju, Jaya, author
Chandos, 2006
Buku Teks