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Buku Teks
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Anmol Publications, 1992
Buku Referensi
Porteous, Andrew
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Buku Referensi
edited by W.F. Bynum, E.J. Browne, Roy Porter
Macmillan Reference Books, 1989
Buku Referensi
Somani, L.L.
Agrotech Publishing Academy, 1992
Buku Referensi