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Majalah, Jurnal, Buletin
Denbigh, Kenneth, author
Cambridge University Press, 1961
Buku Teks
Majalah, Jurnal, Buletin
Kotz, John C., author
Thomson, Brooks/Cole, 2006
Buku Teks
Kotz, John C., author
Saunders College, 1991
Buku Teks